I'd never bother, the amount of grief would likely not be worth the (relatively speaking) pennies people are usually willing to pay for that kind of thing.

A few times per week I get whispered about what setup I use (bear in mind: I'm not doing anything particularly advanced or impressive), and I'm usually happy to shoot them a few pointers, then tell them to go read up on it. If they're not willing to do that, or not able to understand it, they're probably not cut out for boxing. That's after filtering out those who can't / won't pay for the extra accounts, let alone the software used to facilitate multiboxing.

Boxing is, IMO, all about being able to do something the average player isn't, and giving (or selling) a working setup - even if it works at the moment you give it - doesn't change the fact that the knowledge required to update it and fix things when they inevitably break would be missing, so every patch you'd have them complaining.