I doubt it's common to have a first like this be a truly profitable venture, regardless of what you do.

To "limit" themselves like this might not be "wise" in this one-game scenario, but if they manage to build a reputation and establish themselves, it's better to do it like this when the risks are minimal.

However, I probably wouldn't do it like that myself.

Given the early stage of my game, I haven't given it enough thought - but I certainly plan to handle this with direct control. Establish a webpage - probably with someone else handling the transactions, which is costly but a LOT more convenient I expect.

My main worry is how to provide support to potential customers.