Many clubs around the world, especially the higher end ones, will not allow single guys or a group of guys in all the time. Doormen are supposed to keep the guy to girl ratio relatively stable so that clubs do not become a "sausagefest." A club with twice as many guys as girls is no fun for anyone. The girls are treated like meat and the guys end up in fights due to competition. If you are so desperate to get in, find a female companion, get in, then go your separate ways.