All other forms of temporary lodging require registration or licenses, why not airbnb?
Could someone wrap up in a few words how you could scam money from people who want to SELL something?
The most common scam aimed at sellers is the potential buyer (scammer) sends you an email that they want the item but they're out of town and will have their shipping company pick the item up. You're selling a guitar for $500, they tell you they'll send you a check for $550 to cover the guitar plus the $50 to give to their shipping company when the pick up the item. They send you a check for $650 and an email that the check was accidentally sent for the wrong amount. They ask you to cash the check at your bank and then Western Union the remaining $100 to them. Your bank will most likely 'clear' the check in 3-5 business days so you THINK the check is good because the money is in your account. You send them their 'extra' $100. 4 days later you check your bank account to find that the $650 deposit was reversed because it was in fact NOT a good check.
It is not stupid. As the law stands you deduct taxes already paid to other governments from the tax you own USA.
This only applies to countries that have tax treaties with the US.
Quantity is no substitute for quality, but its the only one we've got.