It's how you will cope with the paranoia of getting caught, sleeping one night and waking up with law enforcement kicking down your door and raiding your place. Obviously that risk can be hugely reduced with correct measures in place and being discreet and just careful overall but you have to ask yourself these questions.. Do you want to risk your freedom? Can you cope with the stress? Do you feel you could be successful in vending while following the correct procedures? If so then I don't see why you wouldn't if you can get a good supply and provide a good customer service, once you supply a good customer service you will always get repeat loyal customers if your product is up to scratch. If you do decide to go ahead, I wish you the best of luck with your future business venture!