Since the buyer wants it for SEO, and I would guess that he could do two, three, maybe four or five times better than your current page at best, it looks to me like he can't pay much more than $35K and earn a good return on his time and investment. He can always keep working on lessor domain names.
It's not like you are dealing with Honda who can pay millions.
And non-keyword dictionary words, such as my Shrewd (dot) com, are not selling fast these days even at under $20K prices.
You could always look into doing, contracting, the SEO yourself, but wading through the SEO BS is even harder than wading through the domain name BS where fake half-million dollar sales abound.
---------- Post added at 11:23 PM ---------- Previous post was at 11:12 PM ----------
and if he just wants it for SEO, it's just another keyword domain to him. He could work is SEO magic on bike.com, hats.com or any other keyword domain so he could walk away