I was considering that, but flippers are likely better prepared to purchase a house, do the N activities which make time/financial sense, and get out of the market as quickly as possible. They likely possess the skills to do some of the work themselves, have existing relationships with plumbers/electricians to perform specialized work, know how to handle required permitting, have a realtor on the ready, and a dozen of other things which I am ignorant.

The average homeowner is unlikely to have any of those relationships or knowledge, so there are a lot more things that could go wrong that delay the project or cause costs to balloon. Maybe a lot of people mistakenly believe that renovating the kitchen for $20k will add $40k value to the house, but in practice, the project will cost $34k, take five weeks, and ultimately only raises the final sale price to $35k.