I think fatfishers' endgame is usually to score a date with their winning personality and make their being fat into someone else's (your) problem. You know, the typical Way of the Fat™. Deception probably has a higher success rate than just being frank about their bodies, and the usual worst case is that they get attention from some poor bastard several tiers out of their league until the jig is up.  It probably even works out for them in a limited way sometimes. Sadly, I know plenty of guys who would take the opportunity to get head from a fatty (barf) if they found themselves fatfished. And almost nobody has the balls to be mean about the deception. So, yeah... Source: been fatfished by a couple of asteroids who used clever photography to hide their spare tires/chunky torsos. (fat-exclusively-around-the-middle bodies are harder for me to spot... and also disproportionately [heh] disgusting to me on the fatness spectrum)