Note that these programs are often rebadged "aggregators". For example, AAA's "auto sale" program is Zag (Truecar). Costco's is Affinity Development, http://www.affinitydev.com/index.html
Not saying that anything is wrong with these, but just saying that if you trust AAA or Costco's internal controls and skills, you aren't getting those in these services. You are getting AAA or Costco's willingness to license their name.
As is posted many times in this thread, it's down to time vs. money. These services get you 1/2 to 3/4 of where you could get yourself, at a cost. You could do better, sometimes much better, with more time, but that's for each person to decide.
Not saying that anything is wrong with these, but just saying that if you trust AAA or Costco's internal controls and skills, you aren't getting those in these services. You are getting AAA or Costco's willingness to license their name.
As is posted many times in this thread, it's down to time vs. money. These services get you 1/2 to 3/4 of where you could get yourself, at a cost. You could do better, sometimes much better, with more time, but that's for each person to decide.