Why are companies paying bounce exchange $4k/m for a modal?

Okay so i've done some research and it looks like it's because they have a patent on the detection of exit intent? http://www.faqs.org/patents/app/20140222502

I've wondered how many people actually pay that amount, too. Perhaps they go after larger organizations where a few thousand is a small price to pay for a solution, regardless of how simple it may be.