As shorena said, it doesn't make economic sense to scam/spam with a purchased account because that would mean loosing the money you just spent on buying said account. Doing this would more or less be throwing money away.

1) When accounts are sold, the new buyers will have a greater incentive to try to scam because they know there is a chance it will receive negative trust eventually anyway, so they have less ways to make their initial investment back.

2) Owners of accounts (the original owners) will have greater incentives to try to scam because the EV of a scam attempt verses trying to sell their account would be greater because of the low prices their account would now be worth, when compared to the potential payout of scamming.

Lol. I find it very ironic that someone who is clearly engaged in at the very least the purchase of accounts (and most likely the sale of accounts as well) is arguing against trading of accounts.