Your question made me curious. I sell a bike here and there but don't rely on it. Scooter sales went up 23% last year (source; Hartford Courant) So half wondered about opening a scooter, motorized bicycle kit and ultra light transportation store. Would be a huge undertaking even if only with an online storefront. Not to mention a large investment.
Exposure and liability could be lessoned by forming a Limited Liability Company. (I thought the last C was for corporation Limited liability company - Wikipedia, the free encyclopedia
) Article about a guy who set one up near you. Setting up a LLC in Wisconsin : Bia Securities
Kinda went off on a tangent there, didn't I? snork.
Most dealers will give you a break on kits if you buy in volume so you could test the waters before any big investment.
One thing I can tell you from personal experience is if you hate your job, have to fix it and be happy! Find some thing you love to do and you will never work another day.