Questions I'd ask:

1. How many customers do you have?
2. How many leads are they generating?
3. What states are you dialing?
4. What industries?
5. What times of day?
6. What's the average call length?

These questions amongst others will help you quantify the relative value of this service.

I'm friends with the lady who owns the cafe where our company was born, and we have laughed about this. She gets an average of 12 robo dials for funding and merchant processing per week, and auto hangs up.

Also - if people were in the market for money, why would they wait for you to robo dial them?