You won't touch 100 percent. If it requires a credit card, you're sol for 99 percent of the incentive demographic, if it doesn't require a cc, you can expect a healthy 98 percent scrub/shave rate because a)your visitor already filled out the offer on another incentive site(oh and networks will blame YOU for this btw, just a fun fact), b) the visitor provided fake information just to get the incentive (this is also your fault btw, or so they say) c) you're running an email submit that says it converts on email submit but in fact requires a purchase or similar.
If you get to 10 percent conversion on any incentive offer:
1. Consider yourself lucky as hell
2. Pm me a referral link to the network so I can sign up under you
3. Don't count the money until the check clears the bank.