rusty's criticisms are fair. the genre isn't all that creative and the constant pot references are ridiculous, but i still enjoy the music.
as to why i like the music, my roommate my freshman year loved rebelution, iration, the expendables and slightly stoopid. he played them all the time in our dorm room, and i eventually came to like those bands as well. we still stay in touch with each other today, talking about the shows we've gone to/ are going to. i have a similar relationship with erii. our trip to red rocks for slightly stoopid two years ago was such a good time. it's fun to go to concerts with your friends. shared experiences are neat.
i generally go to concerts because i listen to the artists regularly and don't support them through merchandise or music purchases, so i'll buy a concert ticket and go listen to music that I enjoy for a few hours. i don't feel that a slightly stoopid show is a can't miss event, but i'm already going to kansas city this weekend for something else. i also haven't seen the dirty heads or the expendables before, so that's a plus.
also, just about every concert crowd i've ever encountered are worse to be around than the crowds at white, stoner reggae shows, but i don't mind pot smoke and hippies. we don't get much of the skate/ surf bro element at shows in the midwest.