I have the same Vector underfolder that was purchased around 2006 for around $600. Not a chance I would sell it for $1,000. Fabulous tight build, tank tough, 100% reliable and government willing, my great grandchildren will enjoy shooting it!
For comparison, I sold a Polish PMKMS underfolder kit in like new condition this March for $1050 on GB, Glocks are running $600, and a basic Ruger Mini 14 is $900ish.
IMHO, passing on a clean quality AK for a grand is a mistake.