Abortion is commerce. You pay someone for a service.
Right, but the commerce doesn't go anywhere, the individual does, prior to committing the commerce. This would be like barring private individuals from Missouri from driving to Illinois to buy cigarettes.
Restaruants and hotels are considered interstate commerce, but those don't go anywhere either prior to the commerce either. Yet, still they are considered interstate. I'm not disagreeing with your logic, but that's how this whole interstate commerce crap has gone - the extent to which they have taken it out of context is idiotic.