Depends on where the 4-of-a-kind is happening. If I have 5-5 and board flops 7 J Q, I'm not likely to hold on to that pair, even though I could get two 5s. Peop

Depends on where the 4-of-a-kind is happening. If I have 5-5 and board flops 7 J Q, I'm not likely to hold on to that pair, even though I could get two 5s. People playing "low pairs" with more regularity could easily lead to more 4 of a kind hits. Hell, playing 2-7 all the time can see 3 more deuces on the board.