Q: Why can't you move from PvP to PvE (or the reverse)?
A: Because. No, really. Ok, my *old* info was bad; the core reason is that you are jumping between two drastically different rules sets, and the team has never intended for people to power up in one and then roll over to the other.
Q: Why is necroposting bad?
A: 
LINK
(Grimwell) Re:PvP Merge & Character Transfer FAQ
