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Imagine spending thousands of hours and dollars raising/training a dog/horse/whatever. You're passionate about your trade and fond of the animal. You're compensated for the time you invested in Spot.
The fistful of cash in your pocket isn't going to offset your disappointment when you hear the next owner shot Spot in the head for being inconvenient. It's hard not to take it personally if you actually care about something.
Even more to your analogy, the average lifespan of a dog is something like 13 years.
That does not mean you lose all your hopes and dreams for that thing to grow, flourish, and continue to be something of value for others, even if you have received compensation, even windfall compensation for it.
We could practice being just a little bit nicer to founders and plank owners.
I think it's crazy to suggest that someone can't simultaneously 1) no longer want to run something themselves but also 2) not want to see that thing destroyed entirely.