1: can a socket enchanter add socket(s) to unique items? if so, how many sockets can you add max? ive seen one of these socket enchanters before but at the time didnt have gold to see if it worked
yes any rarity of items can be socketed even unique, max per items is 2 sockets
2: does game difficulty have an effect on exp? and if my char is set to veteran I can still play casual through internet games?
none all are same exp u can get, only choose difficulty will give u more fun playing it.. yes u can change difficulty in internet games and lan games
3: how many times can you keep advancing? I think im at like NG ++++, act 1 like lvl 120s
not sure, but they say NG ++++ only
4: is there pvp?
yes you can make pvp... just type in your message box "/pvp"