A buddy and I have discussed a bike shop for years. We are just looking for a strong investor that needs a good tax write off for about 6 years. That is about how long we figured it would take to go broke with a decent investment.
Seriously, I was in retail for 18 years. Owned my own business. You have to have the stomach for it and need to be comfortable not knowing for sure where or when the next pay check is coming from. That is just my experience.

Good Luck - whatever you do - do what you like doing. There is no sense spending your whole life working and not being happy if you have a choice.

OBTW - Business Degree not required.