It's completely safe as is. You can always get your money back through Paypal and only buy from people with positive feedback. If there was a way to do an easy scam it'd be pretty popular and Ebay would be out of business.
It's safe. Even more so if you use Paypal. You can cancel your order and send a complaint through and easily get your money back. You can even just buy from people with 100% positive feedback. If they have 200 out of 200 people saying "good seller" you can be sure it's safe.