I believe, I wont speak only for My self but for many others as well who still plays stock version of MW2, MW3 and etc COD games, as owner almost all of these games (except black ops 2) and effort and time spent leveling up (in My opinion waste of time), but still since I value My time spent overall, only thing what is holding me back to play on 4D1 is level lose... and also You gain nothing if You decide to quit 4D1, for example: I came here with level 70, start again from 1 (cant play with My favorite glyph and wep setups, kills joy for game and online experience instantly), also if I gather all My strengths to go all over this crap once again but later on decide to leave (or this project gets wiped out or something bad happens), I go back to stock MP (non dedicated servers), I don't keep any achievements I have gathered in 4D1. Its like lose/lose situation for Me, but dont get me wrong I admire your work and dedication for this great project, I just wish there could be a option to not lose anything coming or leaving this place.
ps. I played on old alterwnet (I loved it)