If only!
When you're low down the bill you'll often get very little indeed, at least at the sort of punky do's we seem to play! If there's 8 bands on and they're charging "donations" at the door many won't pay owt, and the soundman always gets paid... Then the promoter takes a chunk of what's left, so there's not much to split! The bar always makes money though, but we never see any of that either. It often used to be that if you weren't willing to accept that you wouldn't be playing!
But we seem to get about £50 (sometimes more!) nowadays, but I never know how much we're getting paid until afterwards as I tend not to organise gigs; perhaps I should ask before agreeing to do it, though everyone else seems happy to get nowt. As it is we tend to stick it in the band kitty for our upcoming recording.
As for merch, we'll have done well if we sell 2 cds and a tshirt...
Though I do know that we're actually getting more reasonable money for our next gig, assuming some tickets get sold in advance and the venue doesn't pull it!