There have been cases where the tools (capital) a company has purchased is worth more than the company, and the company is purchased and gutted just to obtain those tools at a discount.
This is bad for the company, of course, but the tool vender especially doesn't want this to happen - they lose a potential full-price customer for software where there is no real competitor. Further, the company that originally purchased the tool doesn't mind the contract because it helps prevent acquisitions based only on getting the capital. (Corollary: If your company is negotiating out of such a contract, get ready to be purchased...)
For tools that are very, very expensive, this is not unheard of. Think 10's of thousands of dollars per seat, and you can see why this economy becomes reality. Further, sometimes tools are purchased for the company by a client (DoD) and they are actually a small company ( a few developers that won a nice contract) - if the client does not retain the license, then the company might go bust and the license sold for pennies on the dollar at an auction to pay creditors.
Etc, etc, etc. In short, very, very expensive licenses change the economic playground enough that very strange rules apply. Note that "expensive" may also mean scarce, as in the case of liquor licenses for restaurants, or otherwise difficult to get (Qualcomm might not want to sell a given company a license for their CDMA patents, but they may not be able to legally prevent that company from acquiring such a license through legal methods).