Actually, if you are patient and know what sells well you won't lose money (except what you spend on maintenance) on a small bike. Lots of people are always looking for one and they are cheap to begin with.
Ehh, yeah. But it's not just about power it's also weight. Anytime you're going over 10mph it won't be a problem but low speed maneuvers are where most people lose it. Look at what most people say "yeah, it got dropped by the previous owner in the driveway..." hee hee, they never want to admit to doing it themselves...