That's a shame. What a crap rule. Anyway, I haven't actually bought the domain yet.
So in that case, is it possible for me to get in touch with the seller of the domain to ask them a question about the domain?
No, auctions do not work like that.
Errr, actually they do. You're forgetting the obvious - eBay. You can ask a seller anything about their product, any time.
Do your due diligence before you buy. Checking that the domain has pages indexed in Google would be a good start.
We are talking about godaddy auctions.
You cannot do that. Also if you do not make payment to Godaddy, they will suspend your account.