IF it is a flip ehhhh morally you probably should do the upgrades or, more of the profit side of this coin, at least upgrade to pieces that have high contact (laundry, bathrooms, kitchens). 

I want to upgrade from a coin laundry system to coin/ credit card style machine.

It's two sides of a coin in that you will have a much lower tenant pool looking to rent your property.

Which one may be a coin toss.

Give me a call about Detroit if you want to know where you will make a good investment or a bad one I have a lot of investors on both sides of coin depending on who re-habbed the house and who sold the house.

I'm not saying it is impossible it is just very rare and/or very risk - crypto, startup funding, day trading, etc. 

Three years ago I bought a property with a coin op washer and dryer.

We are a medium sized PM co in FL and have clients switching to us all of the time from Vacasa. 

Someone just has to say "it works" and everyone gets visions of themselves swimming in a pool of gold coins."

It's icy fairly often in CO in the winter, nothing out of the ordinary and our plow guys are pretty good, so no negligence on our end, but she was still awarded some money.