Ok this is my first tip.
its pretty easy. Example: Say you have a lvl 120 Tao(none rb) And you get a lvl 5 super wand and wanna use it but taos get 0 strength (uses lots of mets) you equip the wand and go lvl it in market it will keep lvling till it reach 120. The strength and wep exp is ignored. so u can keep lvling it till it reaches your chars lvl But if u take it off Ur SCREWED.
I Hope it helps