You should give the forum your reasons for feeling so, or at least what you honestly think is the main problem. If not it will be very difficult for people to help you in anyway. Rest assure, nevertheless, that the majority of PhD students think about quitting at some time or another during their programs. The reasons are plenty - lack of proper personal support, guidance in writing, lit. review, research methods, time,... The real benefit of a forum like this one is that if your post gives enough information about your situation you are likely to get a reply from someone who had a similar experience or has something relevant to tell you. Please go ahead a tell us your problem :-)
Regarding the value of a PhD, you should not underestimate it. Not only will it increase your skills like Treefrog mentions, it will definitively open-up opportunities that would otherwise be completely out of your reach. That said, this is a peoples world, not a game of solitaire, so you are not exempted from networking and the responsibility of carrying your own weight.
HTH - Hope This Helps