is this a suggestion or a statement....
this would be a good idea if there was ever a single player or coop mode. where all the players fight against a common enemy. however it would still be easy to push your PL to the max. and the esf team has said there will be no single player (duno about coop).
anyway, this has been suggested before. another mod (MS - Master Sword) had something like this. you would save your exp and bring it with you to whatever server you played on. needless to say this was extremly easy to exploit, seeing as how your exp would have to be saved on your computer to be following you around.