When I worked with Qt we built a product on top of Qt 4.8.4. Not 4.8.3, not 4.8.5. This was due to some very technical details, and the product was standalone a

When I worked with Qt we built a product on top of Qt 4.8.4. Not 4.8.3, not 4.8.5. This was due to some very technical details, and the product was standalone and offline so updating wasn't a concern. Why would we have to pay multiple times for the exact same piece of software, lines of code? Also given that software is by default sold with defects (as it is "impossible" to write perfect software), it makes sense that the selling price includes, at least, future minor patches. I would consider them as the vendor covering for its own manufacturing defects (because that's what bugs are). I agree however with charging for new features. That's fine and makes sense.