In limit games, it is usually not incorrect not to fold because of the pot size but because making a one bet mistake (calling with the worse hand) is worse than making a huge mistake (folding and losing the pot). This, in turn, makes the play a correct mathematical decision in the long run, but not all the time:
If I have middle pair and the pot is 15BB against a tough/savvy player on the end, I don't want to fold altough I'm probably beat because if the bet is 1BB, I'm getting 16:1 wich, if we figure even a small bluffing
/worse hand chance, makes this a winner in the long run. But the thing is, how did I get there with middle pair ? Why didnt' I fold before the pot got so big ? Will villain bluff/ have a worse hand this 10% of the time ? Probably not. Pots don't get big by themselves unless you're playing in a very, very soft game (wich most online games nowadays aren't, even at low stakes).
So I don't think the problem (big leak) is calling a single bet on the end, it's calling several on previous streets with a moderate strength hand wich in turns build up the pot and makes us put in more money than we should. Because making a mistake on an earlier street and continuing with that mistake maginifies the hit our hourly takes, wich in turn makes our game less profitable/holds us back.
Also, I think NOT folding in big pots HU with fair hands makes you less exploitable than folding does, if we are talking LHE. C/C turn and river OOP with KK on Qs4s5s6s9x if the pot is moderatly big (7-8BB) can be better than b/f, especially against a thinking opponent due to WA/WB situation.
Thid doesn't mean that we shouldn't take on reads and info into consideration when making a play, on the contrary. Our pot odds
and effective odds should be weighted against the most probable hand ranges of a certain villain. If it gets capped and I have JJ against a nit and an Ace flops, I'll probably let it go. But if I have AA against the same opponent and the flop comes 478 all spades, I will be tempted to think that I am very much in front since he won't cap 44,77,88, SC and the like and the only hand he can have me WB is AKs.