how hard is it to respond

how hard is it for women to repond to messages?!! I know women get alot of messages but how hard is it to say "no thanks"? It's free for christ sake, I write respectfull messages and always ask for a response if not interested but 90% don't bother, do they think they are something that speciall, Im not asking for your first born a polite "no" will do i could even put up with piss off at least it is a response but usually nothing!!!!!!