Whilst it seems nice, I reckon there's probably more going on but they are just too polite to be completely honest... it may be you, it may be them, but at least they aren't being dicks and are willing to give you credit and some coin for any money made.

You've only been with the band 4 months, so it's not like you have been with them for years, it's still sad you feel that way and it's still not easy.

I'm sure you will find some other people to collaborate with and make a kickass band of your own.