If you are in a non garnishment state what happens when a creditor gets a judgement against you is that they get a court order to seize your bank account, or any assets allowed by law. Personally, I would rather have a garnishment, because there are laws on the amounts they can take. A creditor gets a order to seize your bank account and the account is frozen.
And yes, Cash Call does sue. I know people that have been sued by them before. They usually will wait a while after you stop paying so that the amount owed ballons up. The judge doesn't care about the interest rate. It is legal. You signed it. The judge doesn't have much sympathy. In my county, the judge only cares about if you legally owe the debt or not. That is it. If you legally owe, a judgement is entered against you.