No. I don't even think it can be argued that you didn't make a mistake here. If you get a $100,000+ offer for any domain you respond and negotiate, always. Even if you believe it's worth more. Why? Because it's an opportunity to convey your perceived value to a potential buyer.
To be honest. I don't think you'll get an offer like that for sport.ai ever again. Sure, some of these domains sell for high prices, but the sales volume of .ai domains is just too low. Go to namebio.com and search for .ai sales. You have roughly 1 documented sale per day. For .com you have >300 sales per day.
This is an argument against the value for sport.ai, not for it. Just because one person came to you willing to spend $110,000 (assuming it's a legitimate offer) doesn't mean that the next person will, and chances are they planned on picking up both for a redirect.
$110,000 isn't a petty amount of money to spend on a domain, and I wouldn't consider it insulting or a waste of my time. So I'd still reply, thank them for the offer, but point out that it wasn't substantial enough for me to part with it, and probably give them what I consider to be a more realistic price for the domain.
One way to upend such type inquires (if the offered "maximum and final" price is alright with you) is to agree but force a timeframe, letting the inquirer know that this is an opportunity for them and you may [meaning will] no longer be interested in the offered terms at a later period of time.
I Guess , it is yours!
Agent.ai is speculated to have sold in the seven-figure range:
