Why do people say to fold small pairs early? Just curious since I always limp any pair early. I only play them for set value. I assume the reason you play mid pairs is for set value correct? If so what is the difference in playing 77 for set value versus playing 22 for set value? Are you really that worried about being beaten by a bigger set if you play 22 - 66? But not worried about being beat by a bigger set with 77+? I have always been confused by this advice, just wondering if anyone can clear this up.

As for the question in the post, I personally like the preflop limp, everything after that is bad. Just check fold after you miss your set.