appliances are a commodity that represent a minor fraction of the sale price
no one plonks down $2 million dollars on a home to get $30k worth of appliances
no one moves into a poor school district to buy a Viking range
you can swap out all the appliances in a home in a few days
and the idea that these are an "investment"?? how many homes have you owned? no one is making a profit off of installing a dishwasher
and to edit a response...you just flipped properties in a seller's market, you would have made a profit regardless. wait until it is truly a buyer's market...you won't get a premium off easily-done renovations like swapping appliances