[kungfupawnda]

Being a devil's advocate, why would you hire someone when they are already doing the work for free?

[janosdebugs]

Because someone working on something on the side will be much less efficient than someone working full time. If that certain someone is contributing good stuff, you want to make sure their incentives are aligned with your interests.

[yellow_lead]

So you don't stop, or so that you do it more.