Sit-Ins are really good for exposure but you have no clue so I get it that you don\'t like them.
thats just like... your opinion... man....
no seriously though, i sat in with the breakfast at the knitting factory the first time i sat in with them, and immediately after that i was constantly recognized at bfast shows by people i didn\'t know asking me about my band, etc. that was one sit in with a band that isn\'t by any means huge.
when it comes to sit ins, bands aren\'t worried about being upstaged, people like to play with good musicians, and when you\'ve been playing with the same 3 or 4 or 5 dudes every night, having someone sit in can be a breath of fresh air, especially someone who is competent enough to keep things really interesting.