There are probably just too many intangibles to put any definitive spin on it. The same goes for any remodel. There are accepted general rules of thumb, but it all falls back to the market cost of any specific neighborhood. If you live in a $150k neighborhood, your ammenities matter much less to your ROI. You can take an offer down 10% from your asking price and pocket the money you didnt spend. $200-k-$400k houses probably fall into some sort of grey area as to what the buyers are demanding and how much you are willing to spend to appease them, and over $400k you better have more ammenities to justify the asking price.
Yep agreed. A pool seems to be best built if the home is 600k +, As you go down in price, but the pool doesn't, it just gets upside down. At some point it's just a terrible investment and you had better just love having a pool...more than a lot of other things.