I buy and sell on ebay all the time. I don't need new clubs, and I'm happy saving about half on last year's models. I've bought everything in my bag off ebay, and I've been able to resell the clubs I ended up not liking for about the same price I paid. I've had 2 bad experiences on ebay, and I've written them off as the cost of saving money by using ebay in the first place.
A few recommendations I can give are to buy from powersellers with great feedback. Read their feedback and don't just assume that their percentage is a perfect reflection of their business practices. There are many sellers that maintain good feedback because they threaten to leave a neg for the buyer. Many sellers also have mutually removed feedback. That usually means that the buyer would rather have the rotten deal rather than get negative feedback. Ask the seller a question before you bid, even if its only to find out how responsive the person will be if you have to contact them after the sale. Read the feedback they've left for others. This will often tell you about their character. How did the seller deal with problems in the past?
Basically, be smart. If no one else is bidding on something there may be a reason. There are also many guides available, that were written by fellow ebayers.