That's the one thing that I haven't seen any mining hardware mfg do on their pre-orders,.. Lay it out like it is and say "Hey,.. without your amazing willingness to fund/support a new (risky) product,... We wouldn't be here,..so YOU deserve a reward,. for that alone if nothing else. But I guess I'm biased, I've run several startups and I give away the lion's share in order to fund the next big project every time, because I know it's the people who "take the leap" with you, that deserve a huge part of the credit for any/all success.
This is a very sensible way to go about business and one that is terribly lacking in the world of crypto currency. Call it business savvy, karma or whatever you want, but it is going to make your future business endeavours so much easier - and likely more fruitful too.