I am sorry for you, but somebody has then been making profit out of your free work for over a year: as we all know, Vampires arent sold at cost.
I hope you get some compensation for your work.
Everyone reading this post know you are smarter than this, so not sure what you are trying to do with that angle.
I paid for my Vampire, which was functional as is. After that point, the core has been updated x times, with new features/fixes, and thats technically work they didnt have to do, since they already got my money.
But as we all know, its called retention of customers thru good customer service.
When I buy any hardware, I know what I get, and Im not asked to pay anything else down the road. But Im more inclined to purchase from the same manufacturer IF they deliver good service and product.
Wether or not those expectations are met, depends to a certain extent on each and one of us.
But again, you are more than capable to grasp this consept, so..