No.  SixBit has a monthly subscription.  You can come and go as you please with no contractual obligations.

Nope.  Not only do we not have any setup fees, but during your first 30 days, we give you a subscription to our Gold Support Plan to help get you up and running.

Sure.  You can use Support|Manage Account to upgrade or downgrade your subscription at any time.  Subscription changes simply hide or show functionality and do not require any changes or installations.

Nope.  Your monthly subscription entitles you to list as many items as you'd like without having to pay any extra fees if you sell more.