ofcourse u can lvl, u can ALWAYS lvl.. even a lvl 60 killing keltirs will lvl, its just that it's very slow.
the reason people say the macro is for gold not lvl is because the RATE of money making is much greater than the RATE of lvling. but in reality u do lvl . i got my orc from 15 to 20 in 3 days macroing back in open beta.
edit: in those 5 lvls i made about 350k. but u have to realize i was using a macro made on ACtools forum, not the tault macro hehe