It's normal. Once your Tamagotchi character and his/her band make their Pro Debut (passed all 3 judges and became an 'official' band), Guitaritchi (who doubles as the band manager and the matchmaker) gives you a certain amount of money every day. I think the amount you get depends on what rank you have, but don't quote me on that (the reason why I think this is because Guitaritchi gave me less than 1 mil until I increased my skill points to the max and brought up my rank more, which involves participating in concerts). Think of it as your wages for being in a 'pro' band.