which is A Good Thing. Again, its those accounting people again "whats the difference between this and the free version".
Selling open source is like selling any other enterprise software - you need to prove value.
An alternative is to sell support (like pfsense).. which is pretty much the right to file bugs. We also buy a license for Handsontable Pro : we get right to file bugs and the fact that we get new features 3 months before the free version.
Its just a way to package gratitude-ware to pass accounting inspection.