You can sell/trade your account(s) as you see fit and Sony will not do anything. As for how this degrades the game i will take an example from EQPC.
Someone who plans on selling their account usually ends up selling/giving away all their items. On the PC version food was not for regen but required to have for survival. So after a time of people buying accounts that have never played the game you end up with a lvl 50+ character running around newb areas asking how to eat (it was an automatic function, you just had to have the food in your inventory).
Now if that isn't the perfect example of how selling accounts would cripple the high end community then please share your examples. I don't mean it won't have an impact on the lowbie end of the game just that it will not be as bad because even at level 34 I am still learning how to play my charcter.
Suminarin 57 Elven Gypsy PPO
Elven bards make the best lovers.
Proudpine's resident Tard Bard.
Notebook 40 Gnome Cleric PPO
Future Tinker and Dread soloer.
This one time at Bard camp...
Haven't played since 5 June.