There is absolutely no point in having a trust system if you can just sell it away

And let's make it abundantly clear here.. Your account has "value" because of that trust system
That is what you're selling off and there is no way we can verify that the new owner deserves the same trust rating that you achieved

By publicly stating that you wish to sell your account instead of going through an anonymous 3rd party tells me that either

a) You don't really understand why the trust system is important in this ecosystem or
b ) You just don't care