If it is getting payed for and it is something you like, I think I would go for it. Would be good experience and starting your own bike thing sounds awesome. And don't let the detractors and nay-sayers distract or dissuade you. Everybody starts somewhere.
Cool thing is, you might be able to get a job at a shop, learn some of the ins and outs of the business, and then decide/progress from there.
Good luck and keep us posted.