When i'm looking for a new car (espeially specialist cars like rs's), it's not that often you'll buy the first one you look at.....nature of it is to see a few and compare them, so it's bollocks for everyoe to just say 'yeah definately a time waster'!
Not long bought a focus rs actually, drove over 2 hours to look at it (so obviously not a waster), drove it and loooked round it etc and told the guy i'd let him know after i'd thought about it and looked at another i had lined up......then phoned him back a couple of days later to agree a price and bought it as i realised how good it was and didn't think i'd get a better example for the money
If yours is a good one and not overpriced he may well be back