Is this why I still play 10/20?

[Fantell]

I know we have the 2nd nut flush here, but what cards do people think he has if he 3 bets your river raise? Beyond putting him on a desperate bluff I don't see how we win when we call this. He'd have to have the T of hearts which means he's capping OOP PF with something like TT or AT?

Are you advocating the raise just because we'll be called with a weaker flush or a set often enough? If that's the argument, why the resistance to a bet/fold line?

Can someone explain this to me?