Ok, so very seriously going to ask you a question.
Have you ever seen an overweight reptile?
It doesn't necessarily look the same way you would expect a mammal that's overweight to look.
Overweight lizards, on the other hand, may have a thick layer of fat over their backs and sides, making it impossible to feel their spines and ribs underneath. In addition, many fat lizards will have fat deposits under their necks, making them look like they have jowls, and may have torsos that appear pear-shaped rather than streamlined. Obese lizards also may have so much fat deposited in their tails that their tails are wider than their bodies.
Most of the time when you're looking at a fat or even obese lizard, it's hard to tell--and it's the TAIL that's the giveaway.
With small lizards, that have a very defined size limit, being fat messes with temperature regulation, which in turn makes them unable to process nutrients, which generally pushes their weight down again into a normal range. Obesity normally only happens in captivity--in optimal conditions.
Larger lizards might just get overall larger.
Now you say they value hard work, but what that means depends on the era we are talking about. The oil and railway barons of the 1800s in America certainly worked hard, and had opulent wealth to show for it, but they certainly weren't outside pumping the oil themselves.
You can value hard work and still find obesity attractive. Also, the two, newsflash, are NOT MUTUALLY EXCLUSIVE. I know a few obese crossfitters who have stayed very overweight. And they CAN lift, and do work hard.
But that's mammals. You have the problem of the reptile system being what it is, and that's a bit of a different thing.