Did you note the location of the pair on EBay? If it was where you bought the speakers, it could have been the same pair, but it seems like it would be a bit of a long shot for the seller to specifically place the ad after responding to your WTB solely for the purpose of establishing a high price for them. I mean, someone could think to do that, but it doesn’t seem likely. Plus he volunteered that the tweeter took awhile to make sound and took off $100 for that, so it doesn’t seem like he was trying to scam you in any way.
IF it was the same pair, I’d think it more likely that the price was set high to account for the fact that on eBay, sellers are pretty vulnerable to buyers abusing the system and claiming problems with purchases, so maybe that was his threshold for selling it there and taking the risk. A lot of speculation, but as others said, as long as you’re happy with what you paid, that’s all that really matters.