I just had an idea for you Mark.........

You could take your training videos to people or institutions that actually use Cubase.

I am sure there are many, since they used to sell A LOT on eBay a year or two ago...(that's another place you can sell them for 4.97-9.97).

So..

Contact the institutions that you know/think use these products. You'll have to figure out a way to find them but you can strike a deal with them through negotiations which includes future updates for them and support etc.

Good idea in my opinion

Adeel