Musicians don’t get it yet.: reader comment from TimD43 – CNET
That’s why I buy merchandise at concerts… I know that’s the only way to really financially support the acts I like. They make jack s— off of album sales (unless they’re an established megastar with leverage to negotiate terms), but they keep most, if not all, of the proceeds from merchandise sales at live performances.

Some promoters or venues demand 30% or even 40% of the merchandise gross, even if the performer uses their own seller. This and this happens as a result. One time in San Antonio we sold merch from the hotel across the street instead of in the venue – following in Tony Bennett’s footsteps who had come up with that idea a few weeks earlier… I announced that the venue was asking too high of a percentage and I seem to remember that it became our second biggest merch-sale ever.