Long term, reliable parts guys are hard to find. I'm sure you've learned a lot and contributed a lot in 5 years. Buyout packages are not offered to floor employees anywhere, and surely not after just 5 years. Such luxuries are upper management, VP's, "C"s etc..... with tenure.
hate to tell ya man, but your expectation is unreasonable, and quite honestly a bit selfish.
All you owe your employer is a hard days work until your last day. All an employer owes you is a paycheque for said hard work