Quick: Why delete the PSA registation number?

Why do some sellers on Ebay obscure or block out the PSA registration number? Is this so we can't look up the card on the PSA website? Why would this be done?
Do You Collect
Baseball 1937,1965-94,2008-09?
Or Regional Canadian Baseball Issues?
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OPeeChee.Wikispaces.Com

Or Regional Canadian Baseball Issues?
Come be a contributor to the OPC Baseball Wiki. It's free and easy!
OPeeChee.Wikispaces.Com
0
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Or Regional Canadian Baseball Issues?
Come be a contributor to the OPC Baseball Wiki. It's free and easy!
OPeeChee.Wikispaces.Com
Or Regional Canadian Baseball Issues?
Come be a contributor to the OPC Baseball Wiki. It's free and easy!
OPeeChee.Wikispaces.Com
Always looking for Topps Salesman Samples, pre '51 unopened packs, E90-2, E91a, N690 Kalamazoo Bats, and T204 Square Frame Ramly's
Steve
<< <i>Ah. Well, after a brief glimpse at my bank statement, I have nothing to worry about. >>
Isn't that how it always goes. lol
I feel your pain!
My eBay Store
BigCrumbs! I made over $250 last year!
<< <i>Or add it to their registry. >>
That's waht I was going to say.
My Auctions
A couple of years ago I bought a nice Montana rookie that was graded a 9. Then a month later, I'm searching on ebay and I see another one up for auction that looks very similar. I check the registration numbers and yup, it's the same one that I'm holding in my hand. I saw that the seller only accepted money orders or cashier's checks (surprise, surprise), so I was positive it was a scam.
I didn't want anyone to get cheated, so I notified ebay so they could end the auction. I never heard back from them and the auction ran it's course. When it ended, I notified the buyer so that he would know about it before making a payment. I never heard a word back from him either.
The end result is that I felt I did everything I could to try to avoid someone getting cheated. Since nobody bothered to get back to me, I can't tell you if it did any good.
- John Wooden
What would you guys say is the more frequent threat, the fake auction or the dope who thinks they can get by with stealing your cards? I would think the former, because the latter is fairly easily remedied, at least if you have a scanner, but I could be wrong.
I used to chisel out my numbers when I posted scans in the Mail Call thread, but I rarely do these days, because I've usually always registered the card before I post the scan here.