fuck, thats brutal. that truly is the most effective strategy.
When I worked as a telemarketer, I loved these "strategies" that people would come up with like setting the phone down or telling them a story, asking if THEY'd like to be called during dinner, yada yada. I was given bonuses based on my "average call time", meaning how long I kept them on the phone. When people put the phone down, I knew it was payyyydayyyyy...
But saying yes would've totally fucked me up, because I would've been even more excited that I was finally making a sale.