i'm in the process of selling a 4 letter domain name, that stands for a major financial product, that gets 20-30K searches a month, and that's currently ranking #1 for that keyword in Google...and the most I was able to get from the 40 companies I contacted is $7,500(estibot value is at $15K).
And that's for a product, that has a transaction fee based model...to a point where a single customer could be worth 5-10K per month, and a big customer could be worth $100K/mo
BTW the estibot value for the hall.com domain is $294,000