sorry but u can delete ur main by mistake, a good excuse is, i was deleting my alt characters and deleted the 70 without looking...
when i wanted to quit wow i deleted my char and wen i came back to play i said that to a GM and he sed ok. Also if you tell a GM that u wanted to quit wow and now ur back playing, he will also give u ur char back, that way works too as i found out after i got my char back by lieing