I hate to sound pessimistic, but you guys will never get paid. IF you win the lawsuit, you wont see any money.
Bottom line, if they go under and file bankruptcy then you will never see a dime even if you win the lawsuit. If there is any money left in ibill's account when that happens (not likely) it will go to creditors, we will be the last on the list to get paid.
If you don't believe me then fine, by all means waste more of your time and money on ibill. I hate to feel like you are letting them screw you, but you are screwing yourself worse by pouring more time and money into this, total waste. Again I am not a pessimistic person, but you shouldn't be a naive person either. This is the 2nd third party billing company collapse I have gone through and I know others that have gone through this with several other billing companies. It happens a lot, and I have NEVER heard of anyone getting money from the company after they went under.
You also need to read your contracts with ibill, I believe one thing to note is the lawsuit will be held in their state, so you waste more on travel, and LOL don't even think about having a lawyer tag along. Also, another think to note is that most of these contracts basically say, if they don't get the money, then they are not obligated to pay you, some other hold harmless clauses, etc... pretty standard shit, they covered their asses with these contracts and 99% of you did not read it (or understand it) when you created your account....
If you really do proceed with a lawsuit please post back in 6 months and at least give me the credit that I was right.

Good luck, maybe you will be the first of thousands of people who have tired and failed... Also, if ibill somehow makes it and starts paying again, then you wasted all your time and money to sue them for nothing. Either was it is a waste.
BTW, they owe me over 25K in past checks, and i will likely lose about 50K + in furture rebills.