We've had nothing but positive feedback from the CMS customers we have who use Chat Recovery. What I'm not sure about is if most are as concerned with whether the service provider is deserving of the % as they are in recovering as many exits as they can.
To add a bit more to the argument this also doesn't consider the bookmarkers who may come back up to several times and are simply reluctant to join...but who would have likely paid full price. You're definitely going to give up 50% of some sales that normally would have been 100% in house joins.
I have to agree with Stan on this. The only way to know the ROI and if the % is justifiable would be to split test a tour that uses Chat with one that only uses your in-house discount methods.
As an Elevated X user you can easily setup a cloned version of a tour in the CMS in about 5 minutes if you want to find out
If you need help with this let us know.
AJ