I would take you at your word, but right now your word says literally "I'll do my best to give you the discount" (edit: if certain scenarios come to pass, such as you starting a company). That's pretty weak.

Interesting experiment. The danger is you get a handful of takers, then you have to live forever with the admin overhead of keeping track of them (as they change email addresses, etc. over the years), all for a little temporary pocket money. I guess that's why you need to say things like "I'll do my best." Maybe you could add a condition, saying the deal will kick in once X number of people sign up, otherwise everyone gets refunded.