So the guitarist in my cover band also plays in another cover band. He asked me if I could fill in for a gig in just over a month as their bass player cant make it. I filled in for a fundraiser gig a couple months ago for them, but that was only one set because it was a multi-band event. I only had to learn a handful of songs for that so no big deal, but this upcoming gig I will have to learn at least half of their 3 set setlist. The songs arent really hard, but I just got the full setlist and it hit me that its going to be a fair amount of work. They said pay would be an even cut, just like any other gig, but Im the one cramming to save the gig. I told him I would do it (before getting the setlist), so I dont want to back out now, but would it be wrong to ask for a few more bucks? I dont want to be petty but in other bands I have been in, when we had to get a sub, we payed them more.