You need to present a whole lot more information.
How does the transporter work (operationally)? Do you dial in a range and distance? Do you specify "coordinates", and if so, how are they determined? Is this a "magic" transporter which will automatically find a level spot on a planetary surface and deposit you there (with zero relative velocity)? (Note that I find that one preposterous, but you're the author.)
For interstellar transportation, it's clear that you're talking about a single-station transporter, a la Star Trek. More conservative send/receive booths won't do, since you have to get to the destination the first time the hard way, and that just won't work for galactic-scale travel.
What, exactly, is the cost of a jump? Not only in energy (and its associated economic factors), but things like computation time? How do you handle relative motion? If you jump into space near a body you will be accelerated in some direction. If you reverse jump, what happens to the speed you've built up? This could make recovery operations just a bit tricky. Different parts of the galaxy (even neighbor stars) have wildly different velocities - how does a traveller handle the difference when she appears in a different star system?
If it's not "magic", a planet-finder needs to be in a spaceship. In general, we don't know the distance to any star, let alone its planets, with any great precision, so presumably it will take quite a few jumps to fine tune a location. Furthermore, the ship needs to be of good size, since (among other things) it needs to be able to actually find a planet once it's in the star system. And that's not necessarily a quick process, since it effectively requires mapping the star field over a period of time and looking for apparent motion. If you don't jump into the system well above the plane of the ecliptic, you'll also need to be prepared to map twice, the second time after you've jumped to the other side of the star. The spaceship does not, in principle, need a lot of maneuvering capability, since it can always jump near the star, build up velocity, then jump to a point chosen so that the transferred velocity vector is a stable orbit. BIG NOTE - If you can do this cheaply you've got the makings of a perpetual motion machine or over-unity generator, and this has other issues.
But also note that, unless operation is essentially (operationally) instantaneous, the ship is vulnerable while a new jump is being computed. If such computation takes appreciable time, you can't have "panic button" which permits recovery from a jump into a Bad Place, like too close to a target star.
So you've found a good planet and you're in orbit around it. Now what? How do you get down? On earth, LEO has an orbital velocity of about 8 km/sec. If you attempt to jump down to the surface, what happens to that velocity? If you have to get down the hard way, you'll need reentry vehicles. The more capable the RVs, the more expensive the main ship, and the fewer the number of companies in the business.
So now you're on the ground, the atmosphere is breathable and the temperature is OK. What now? How long before you're comfortable that the local fauna and flora won't find you crunchy and good with ketchup? Diseases? Allergies? It would be pretty mind-boggling to find that the local biochemistry is both compatible and friendly. But let's finesse that one.
What, exactly, does the end-user (as opposed to the explorer) get out of a new planet? If it's just expansion of a country, the exploration effort will be carried out by a governmental agency, not a private one. And unless the jump cost is really, phenomenally dirt cheap, shipping new infrastructure to a new settlement is going to cost out the wazoo. The settlers can do it, in time, but it's chancy. Take fuel, for instance. Do you have any idea of the effort required to find oil deposits? Or the sheer amount of materials that go into a refinery? Unless you postulate a bootstrap process, the amount of stuff that needs to be shipped is mind-boggling, and a bootstrap process is going to take decades. Lots of prospectors (many of whom will die) over a large area. Minerals found, maybe - but maybe not, stuff is where you find it. Small-scale extraction. Small-scale transport. Build-up of scale. Meanwhile, everybody has to be fed and clothed, and without the infrastructure (and working in a new biosphere which is sure to have unpleasant surprises, especially if it's compatible) agricultural productivity will be low, so you'll need lots of farmers who don't live all that well. Plus, of course, once they do get up and running they may well take the position that they'd rather keep what they have rather than sending it "home". Remember, it's been decades and their kids think that the local planet is home.
Send in robotic factories to exploit rich mineral finds? Sure, but if you've got robotic factories, why not use them at home?
It goes on and on. Unless the transporters are really, really cheap, it's hard to see why anybody other than the desperate poor or the ideologically insecure would take plunge. And with this sort of customer base, it's hard to see how it would become big business.