Stupid rakeback question

I am relatively new to the joys of rakeback and only get it on two of the less popular poker networks.. but was curious if it benefits sit&go/MTT types also i.e. getting back 25% of the $3 fee on a $30 tourney. Wouldn't affect me much but I do have friends who play online without rakeback that are almost exclusively sit & go types and was wondering if it would benefit them...