how to karma if everything gets deleted?

First, Im not asking anyone to give me any karma or am i calling anyone out Im strictly asking a question about them. How are you supposed to raise your karma points if every post gets deleted and the few that dont someone reports? Why does do I need 50 karma points to make a post but it shows I have more than that. Example; there is a subreddit that says you need 50 karma points to post but I have 164? Why isnt it letting me post?