I read some threads about powerleveling and now i am curious, is it possible and if it is are there people on jsp doing it?

If there are not, i would take some gold too like 2,5k of fg worth.

I dont think its possible. Not like the spring valley at least.I havent touched tera for 2 weeks, but never heard of any exploit to "plvl"

I also have 5.5k Mt gold for 275 fg

There is no power leveling anymore, you'd have to give access to your account to power level.