Not raising Big pairs PF

[Frond]

Playing live 2/4. 3/6 Almost every time I play now I see a few people who never ever raise with TT on up. I saw a lady yesterday not rasie PF with TT and she ended up winning the pot but because she didn't raise PF the pot never got that big. Same thing with some guy who had KK. He ended up winning a fair sized pot with his hand but it should have been twice the size as it was. Yea yea I know, most LHE players suck but these types of players are really hard to read at times because they never raise with big pairs. I guess you have to make a mental note on who plays this way at your table and bookmark it in your cranium.