We can't really toss away 99% of the possible contractors just because we want them to take market risk, which they're uncomfortable with. I would say it's very important for our growth, to allow us to work with as many contractors as possible.
Why not only work with people who actually believe in your product?
Paying them in Dash only creates more incentive for them to do a good job.
As an example of the 'eat-your-own-dogfood' approach working very well, see
https://forum.getmonero.org/8/funding-required.
We raise funds in our own currency, and pay devs in that same currency. Most funding requests are done in less than two days.
Once nice feature of this method is that only the people who believe something is a good idea have to pay for it to be done.
There is no moral hazard from a vocal minority forcing the silent majority to go along, via printing more and resultant inflation, nor is their any bickering over proposal priority/propriety.
You're already seeing the problems with zero-sum quarreling over scraps, as the soda machine people fight with the marketing or whatever people.