Question About Facebook Ads?

I'm wondering why some people buy pva facebook ads account bulk? Why 1 facebook ads account not enought for advertising? is there any trick?

Thank you.

The fact is to buy many Facebook account is ban. when you are going to spend high on Facebook ads most of the account get ban after few days. And then a solid roadblock until the account unblock. Sometime few account never unblock some of them does. Thats why people need many Facebook account if they have a solid money making method with Facebook ads.

May be they have to handle many facebook pages

I'm also eager to know that, how to use them in money making.