I have bought second hand bits off EBay in the past.
The last board I bought, which was over three years back now was the Sabertooth P67. It was going to be the base of my new system at the time. I had no other bits to fit that board so when I got it I just left it in the box.
When I got a chip to fit, about three to four months later I got a right shock. All the pins and I mean all were squashed. I had bought a right lemon.
After many weeks of back and forth contacting eBay and trying to contact the seller I finally gave up, counted my losses and moved on.
I went to a proper shop and bought the Sabertooth Z77, which I still run to this day.
Which shop ? From OCUK of course and from that day I have never bought my PC bits from anywhere else.
I kept the P67 until a few weeks back actually just to remind me of how stupid I can be.
As for buying owt from eBay, the only thing I get is strimmer line for my Black n Decker.
I would say if you can afford to loose £40, take the gamble. Make sure as soon at it arrives to check it over with a very keen eye on the pins.