It's because he knows SGC would have graded it accurately.

As far as Probstein relisting cards after sales. I have seen this done several times with 205's. I have not bought from him in yrs because I thought I was shilled up on some high grade AB's a few yrs back. 3 of which I lost last second and was relisted with a BIN 2 weeks later at about 20% higher than closing bid which was already high enough for the cards. I got crazy on bidding but still got out bid on them This thread kinda confirms that there is some awkward bidding going on. Then again he gets great prices for his cards so the buyer might have consigned the cards back to get a quick flip or try anyways.