I'm really happy brewing 1 to 2 gallon brews, and have no thoughts of scaling up at this point. This allows me to brew almost weekly, which means I can hone in on recipes. That's what I have done with my APA and ADA brews based on recipes from Emma Christensen's "Brew Better Beer" book.
Since I prefer drinking from bottles, I have no desire to keg. Smaller batches work well for me since I don't drink that much beer in one sitting. It's analogous to baking bread, which I do almost weekly as well, and at the same time as when I brew. A 4-5 hour window for second proofing of sourdough allows plenty of time for brewing or bottling.
Long story short, I take the OP's post as a cautionary tale. Small batch brewing fits my lifestyle and you won't see me posting an "Everything for sale" thread, since I'm not all that heavily invested. More is not always better.