No...absolutely not. I've gotten a lot of great deals on Ebay, but about 5 percent of them, I got sent "junk" or they cheated me. Because of that, I do not make large dollar value purchases. One time my used Olympus DSLR camera was delivered to the wrong address (that wasn't the sellers fault, except the seller did not allow for a provision for the buyer to sign for the item upon receipt). Fortunately, the person found out who I was...also was honest...and had me pick it up from them. UPS delivered it to the wrong address during the Christmas season rush, and just dropped it off on their front porch with no required signature.
I also got lots of other examples of scam or fraudulent activity. One time I bid for a great price for an item on Ebay, and she said that she dropped it or damaged it somehow. So she didn't want to send it out to me for that low price, being that it was destroyed. Another time, someone just collected our money and only sent approximately half of us the items (a number of us bid for them). I found out about that, because I was home with an illness, and emailed everyone else to see what had happened. Other times, the wrong items are sent and I believe they do it on purpose. But because about 95% of the people give us good deals, we have to outweigh the good with the bad. But I would limit the risk to no more than about $200 (USD).