A buyer should also ask the sellers for a lower price after the initial prices are given.
What blows my mind is there are multiple people in this thread saying that that is perfectly moral, ethical and legal, and the people in the class action got lucky because this would have all fallen apart in the courtroom.
My mechanic friend heard about it, and gave me the following warning.
The mechanic I was working with had an application where you entered in symptoms (e.g. belt noise), and it would stack rank plausible-sounding repairs by profitability. (e.g., should you just replace the belt, should you replace the alternator, or replace the A/C compressor) It used the markup of the parts needed for each job, hours you can charge, actual hours worked, turnaround time (part lead time), etc.
I switched mechanics, and the maintenance cost of my car dropped 75%. It also was at least twice as reliable after that.
Apps like that (and the plumber one) should be illegal. Their only purpose is to defraud customers, so the developers + the customers should be facing jail time.
By the way, the home value and income estimates were higher than reality, and his quote was also fairly high - though not the highest