What's not to like indeed? With FLOSS you get access to rewrite the code to suit your needs, independence from the provider, possibility to create as many copies as needed (no volume licensing)...

And most importantly, a guarantee that any paid investment to improve the code will be available in the future, no matter what happens to the original provider company. If you pay for closed source instead, the company going bankrupt may convert those investments into sunk cost.

You don't seem to understand that, by being closed source, your product lacks all those desirable properties. Having a strong desire for those benefits which disqualifies any product not complying with them, seems perfectly rational, it's just that they have a different balance of values and benefits from yours, which apparently only value the provided features.