Sweet Willie

I travel a great deal and my company keeps the milage for the VIPs. It would be nice just once and a while to fly first class. Is it possible to purchase a membership through the airlines that allows you first class upgrades. Example, 4 upgrades per membership that can be used for the membership period? I just don't have the time to do the research? Like right now I am sitting in an airport waiting to get on a flight to the west coast and its over booked and I am in the back of the plane. This flight would have been great to get an upgrade.