First, I would put a for sale page on the domain. You're probably losing out on a lot of offers.
If you've had it for 26 years without any offers close to $100k, then maybe it is unreasonable.
Have you researched 'kiti' and related companies that may be interested in your domain? You need an end user, maybe even a unicorn, to get $100k.
That being said, talk to the broker and see what you can negotiate. If the offer is $10k and they're firm on that price, I wouldn't sell. You can likely get more with a little work.