These 4 letter domains crack me up. Mostly because its interesting to see how fast times have changed in such a short period. I was buying up 3 letters for x,xxx in 2005 and 4 letters were xxx. Now 4 letters have recognition as x,xxx and alot of 3 letters are xx,xxx
Upon deeper reflection, and more importantly when one is ready TO DEVELOP ones domains,these 3 or 4 letter domains dont lend themselves as easily to SEO as domains with actual keywords
Now, I am not by any means saying these 3 or 4 letter domains are worthless. Far from it, I use a 3 letter domain for my company email and when you want to be efficient with email, nothing beats making sure emails are delivered than a short .com domain
But as far as SEO and building a brand off a 3 or 4 letter domain, its tougher then most think , and maybe not as good as finding a longer keyword domain
I like NLAC.com better than some of the other 4 letter.com domains I see out there, and see some practical usage when checking for acronyms. Im also kinda partial to the letter "N" in a domain for National
Id say 2k is a VERY fair price and generous price
3-4k offer is extremely generous
But for the right end-user, you never can tell, but thats a waiting game, and I like appraising domains off of development potential not greater fool theory
Hope that helps