I generally do not like house rules. I think some of the house rules came about because people misunderstand the rules of the game. I do recall when I first started playing Monopoly, I was just taught by other people. Then one day, I decided to read the rules. I was really young and had difficulty with some of the terminology like "mortgage". I didn't finish reading as my comprehension was not high enough to understand all of the business terms. I've more recently understood how wrong I have played it all along.
I have made house rules on games that I did not like before. I house rules Star Trek Starship Tactical Combat Simulator to add some Starfleet Battles shield rules to the game. It made the game more interesting and made it worth putting up shields. Just doesn't seem right when you play a Star Trek game and choose not to put power to shields on some ships because it is a waste of power. My friend and I made house rules for Zombies because we just hated the game. We never ever played it again even with the house rules we came up with.
It was interesting that some people house rule open money in Power Grid. I did not realise hidden money was to stop AP. I am replacing it with chips. I prefer hidden money because when you have auctions, hidden money makes it difficult to know how much you think you can outbid opponents or push them to spend more. I would use some type of shield to hide the poker chips. I have the Deluxe version and the small plastic tokens for money are easy to hide, but hard to stack and easily slip out of your hands. Stacking chips help you count your own money, so you can easily know how much you have. I do a lot of analysis with my own money regardless of whether or not it is hidden from others. Chips make it easier for me to analyse my own money than bills.