The motivational approach I took was slightly different than crowdfunding. Instead of directly funding the tasks you want to see completed, the bounties are donations to charity made on behalf of the tasks. They can be either made immediately to establish your level of seriousness or made when the task completes, to provide ongoing motivation.
Since I am focused primarily on motivating city governments and businesses, I felt the same way as you: direct funding is not the right thing to do. These governments and businesses already have funds. If I want to sway their decision-making processes in some unusual way, my experiment is using public charitable donations.
Just as a demonstration, I just created a task for this (admittedly, not really what I have in mind for my site, but I'll take whatever eyeballs I can get) [2].
[1] https://www.brianstaskforce.com/
[2] https://business.brianstaskforce.com/task/385/oracle-address...
Still, I like your project quite a bit. Looks very nicely executed.
Open source developers don't bite, and they never say no to a bit of extra cash :)
Thing is I likely would have done the work anyway. Bugs are community issues that effect everyone and contributing fixes for them keeps an open source project vibrant and active. But instead of feeling good about fixing some obscure bug I felt like I'd been used by someone who didn't want to pay for a developer.