You were paying for it the whole time you just didn't know it. Oracle was getting a hefty % of the CPM. It's just like having crappy creative, pay now or pay later. The results were always pretty meh anyways.
We've done extensive A/B testing back when they were available. We have predictive audiences for both sales and service from your database (CRM, DMS). Lookalike audiences based on these outperform Oracle 2:1 or more in every metric. This is how our agency and dealer partners increase reach. We feel this approach works best we do the nerd stuff they do the creative stuff.
There really isn't an easy way for a dealer or agency to do this in house either. The barrier of entry for machine learning is really high. You need to know what you are doing and have enough data so an out of bag testing procedure can be conducted. With an approved integration the sync process takes minutes versus up to up to 72 hours. The integration is not easy either, Facebook changes the rules every month. I am pretty sure we are one of the only ones in all auto that have it. This means the audiences update every day. We do this to ensure each of our 11 audiences are as relevant as possible. So if a customer buys, we remove them. We also use a data hybridization process to combine the PII from all past transactions as well as the CRM data. This ensures the highest potential match rates. Btw you have to prepare all of the data to their standard. This requires code or ninja level Excel game...we code. You also need a few million sales and service ROs to train the models.
You can't just import purchased lists. Today you have to declare at a record level whether the data is 1st party or not. We started work on this in Oct of last year so we've seen some stuff. Anyone that has ever been on one of our demos will tell you we eat, breathe and sleep audiences and want you to use them everywhere not just FB.
End of blatent self promotion