Ive researched the domain a little and I think its a winner. There are tons of potential end users for the domain, its a .net most other extensions regged. 9k exact searches per month low competition.
Its a quality domain that you can get $xxxx for i think for sure.
Im not sure I would of paid $500 for it but its not an unfair price, though for a 4 day old domain?.
Was the domain a dropped domain, when was it first regged?
As a reseller I would hesitate to pay more than $50-$100 for this domain. Im maybe just a bit tight fisted.
The end users are there though and you can get $xxx-xxxx
Good luck.