Yeh, as others have stated. Pirmarily over 1,000 you can trust. Because, just 100 or w\e can be falsely repped, and getting payed for scams. I have tried to buy a fiew things from Ebay and got screwed over, but I'd say it's fairly trustworthy if you spend time finding the right seller.
I always buy from sellers with a high rating and I always check out their Feedback, it's a must have for buyers. And also, buy with paypal