Adobe doesn't charge by the number of success events, but rather by the number of server calls.
A site that generates 100,000 page views without any eVars/props is billed the exact same amount as a site generating 100,000 page views with 50 props, eVars, and success events.
So, in short, if you want to stop a given site/page from counting towards your contract, you would want to stop data from being sent to Adobe's data collection servers altogether.