I am wondering if I upload all of my past clients into ads manager in meta will meta only send me buyers that buy from me if my sales process is good? I have hundreds of past clients that I can upload into meta as a csv file. Is it likely if I upload a list of hundreds of buyers that I can bring my actual cpa cost foen to $20 per sale or less? Has anyone successfully done this in this group before? And why choose leads instead of sales if you have hundreds of past clients that you can upload into ads manager as a custom audience?