Who does just one? That’s worse than not doing either. Since they’re captive screws, doing just one can force the connector to wedge in crooked. I’ve had issues with tightening one too far before starting the threads on the other. Sometimes you have to go back and forth a couple times
You’re only making money if you downsize, move somewhere cheaper, or switch back to renting. If you move and all the other houses have gone up, then you just end up having to sink any gained equity into affording your new place. Rising prices really only help developers, realtors, and REIT’s.