Needs balance. Should be a risk for thieves.
Stat loss?
Grey to everyone for extended period of time?
8mil in 2 weeks. F* me. I hope that was in a dungeon at least, if not then it is absolutely OP.
Thieves are the only class that can be thwarted 100% with a 50 gp purchase... they are balanced.
If you don't want your stuff stolen, then get a lock box, and don't let your stuff get stolen... It's not rocket science.