If you want to make money selling bikes it needs to be a big shop that does lots of sales. Your hourly will be squat, and the commision will not be that great either. You also need to do it a while to build up sales skills and clientelle.

My advice would be to have a real job and work in the bike shop partime for fun. The big value is the discount you get working in a shop. However as Supergo sells stuff below wholesale anyway, probably no bargain there. So, in conclusion, work for a fun local shop part time and do not ***** your self out to supergo as you will not get any extra benefits and spend all day dealing with people whose sole priority is "how cheap can I get this"