What a shame our world is inhabited with such greedy and selfish people. Thank you for trying, and for letting us know, Andre.
We have no intention to speculate about the motivations of the rights holders.
But, just for the sake of completeness, it should be mentioned that these type of decisions do not always have to be about greed, however.
In some cases, developers encounter emotional barriers when they have to attach a seemingly low price to a piece of intellectual property they created over the course of many, many years. This process may mean having to admit to yourself that your past accomplishments have little value (anymore), which is easier said than done in some cases.
For others, it can be difficult to imagine other supposedly less qualified developers take over and potentially ruin the reputation of what used to be a well respected piece of software. Unless there is a sizable amount of money involved, some developers might not be willing to take that risk especially if you are still selling a modern version of the same application for another platform.
Plus, there are some people who develop software for a living and are sceptical about the concept of giving away source code for little to no money since this seems to go against their own interest to sell their services at fair market prices so they can provide for their families.