Your PayPal subscription is separate from your Sim Dynasty team subscription; cancelling one will not cancel the other. If you cancel PayPal without leaving your league, you will continue to have access until your team expires, although you can purchase additional months using site credit or individual PayPal payments.
On the other hand, if you leave your team without cancelling your PayPal subscription, PayPal will continue to send payments for you. These will go into your Sim Dynasty account.
We cannot cancel your PayPal subscription for you. To cancel the subscription, log in to PayPal and go to https://www.paypal.com/cgi-bin/customerprofileweb?cmd=_manage-paylist and click Cancel on the link at the end of the subscription line. Note you may have more than one page of subscriptions. Again, canceling your subscription will not cancel your team, or put it up for sale; you will continue to have access to your team until your remaining credit expires.