Many MMO's offer a free trial for either 10-14 days (I can think of 2 right off the top of my head). After that, you pay or do not play. So IMO I think all basic members should be VERY thankful they can participate in the current capacity.
Moreover, if you want to get into price...you'll find that POTC Online is one of if not the most inexpensive out of them all (comparable MMO's). You can purchase a 3 month game card for $24.95 at some of the local retailers or sign up for a discounted plan via piratesonline.com. I believe one year saves you 33% (39.40 off annual - like paying 6.67 a month instead of 9.95).
So just imagine, playing for 10-14 days and then getting a message that your trial has ended please select a form of payment to continue.
