Well, whether we are ok or not with paying taxes, and whether or not they are well spent, the simple fact is that IF the revenue department of each jurisdiction decides that you ARE operating a business, then you have revenue, and you owe them their cut of the revenue (sales tax), and profit (income tax). Flying under the radar works up to the point they DO see you, and then life gets really complicated. Doing the business thing "legally" is also complicated, but less so than if gubermint decides you have what they think is their's.