How about this:
I buy the account for 30m rsgp, only I get the account for just 2 months. After that period I give it back. If I don't give it back after 2 months have passed, you're free to recover it, without me reporting the account login to sythe admins. If the account is recovered before 2 months are over, I report you and the account login to sythe, and it gets blocked from all future purchases.
This way you can legitimately resell the account after 2 months and make a second profit.
Deal?