Is it ok to give a bounty for work on HA?

I have some things I want to get done on the integration front, for instance getting a function for controlling a ventilation hood in this integration: or a media player integration for J River Media Center. I realize many people who do this kind of things probably work as programmers, and are well paid in their “day job”, but is it ok to put up a “bounty” of lets say 10 dollars for what i want done, and other can eventually join, or is this against the open source spirit?