I have a question for you: why would anyone buy a stolen Microsoft key from you - that is almost guaranteed to stop working in the future - when they can just torrents and cracks to get the program? Essentially the risk is the same, just that they'd lose 5 or if they go with you. And to top it off, you're not a senior or established member of the forums, you can get abandoned the account when things turn sour. I don't think anyone will buy from you here.
Your point is valid, except for the fact that most people who purchase these keys, especially in bulk, resell them illegally to make profit. I do of course not condone this activity, but it's a fact that people do that and it's one we have to knowingly live with.
Yes, who's to say I couldn't abandon my account and my responsibilities as a seller, that's up to each individual customer to decide if they think I am trusted enough or not. Personally, I wouldn't trust myself if I were said customer, but we all have to start somewhere, right?
Also, yes, I do understand that these keys may get blocked or stop working in the long term, and I'm trying to the best of my ability to replace such keys for the customer, as my main priority is to keep as many long term customers as possible.