You don't need the "Pro" and ya don't need to give them a credit card. If I go over, and I have several times I just do a one-time payment. I believe you need a physical address for them to trace ya down if ya don't pay.
It adds up fast but there is a billing area you can keep track of where your at.
I expose stock scams to gain knowledge about investigating the stock market players and for the entertainment it invariably generates. I've received NO compensation in any form for such, except for a few thank yous...