Looks like you’ve found one way: asking a meta question.
Show, don’t tell. Show how your product will benefit me. Make it clear and short. Persuade me to invest my time in your product and that you’ll support it.
Are you trying to get devs to just give you feedback on the product? Or are you using dev testing as a marketing tool?
“Developers” is a huge, very heterogeneous group. No single strategy is going to work. Talk to individual developers first, and find some who are receptive to what you’re doing. That will give you a starting point to define what the larger market looks like.