Personally I'm against buying PSA's or CSA's.
And here's why.
When you post personally written add, not some generic post but something unique, and your very own, people will respond to that. They would make that first step toward You.
And they would really want you to be their sponsor, their mentor and guide through this business.
I think that gives you an advantage over some random add they clicked and then by some fortune ended up in your lap.