I was in a simular situation.  I won a fair 
amount of money and used some of it to set up an 
ebay account and start buying. My first attempt 
to buy a cel resulted in the seller cancelling me 
because I had no history (over an item that sold 
for less than $60 - my budget at that time was 
$10,000+)I ended up buying two auctions as a "buy 
it now" instead of waiting and very likely paying 
a lower price just to get a history with ebay and 
prevent another cancellation.  Although I am 
happy with both the cels and the results, I am 
still very angry about being forced into such 
tactics. The seller did not even try to contact 
me but simply assumed I was dishonest. I admit 
that I have never been on the selling end so 
maybe I am a little biased. I just know that I 
will never do business with that person again, no 
matter what they are selling. 

This person may be a scammer (it does sound very 
suspicious) but I would be careful. 
Goodwill/badwill can extend beyond just one sale.