Just an idea: How about you make it one step more interesting, if the purchaser executes certain milestones within a certain time period, the price will be free

Just an idea: How about you make it one step more interesting, if the purchaser executes certain milestones within a certain time period, the price will be free and instead equity only? (Otherwise they would need to return the domain back to you) Ideally the milestones would not be development oriented (given that you seem to be a designer).