Someone who's read the terms of use and licensing and all those other jazzy legal documents could correct me if I'm wrong, but is there anything stopping a comp

Someone who's read the terms of use and licensing and all those other jazzy legal documents could correct me if I'm wrong, but is there anything stopping a company from having one of their promises an equity stake in the company? Say, I'm running a kickstarter and put a tier of funding as "equity". I put aside 10% ownership of my brand to those willing to pay $1,000 or more (for instance). If I set up terms that those who pay above $1k get equity relative to how much they contributed would that be wrong? An example, 10 people paid $1k to each earn 1% equity in my new company. Or, say 20 people each paid $1k, would get 0.5% each. (20k total, 1k contribution). Terms are loose, and this is all speculation, but at a theoretical level is there anything wrong with the founders creating such an incentive?