A recent trip required a hotel room, which was booked via Expedia. All went well, etc. etc., but now an email awaits me:

Expedia
Dear Frank,

You should recently have received an email from us regarding your last trip
booked on Expedia to $LOCATION. Your opinion is extremely valuable to us and we
hope you'll take a few minutes to complete the survey:

> Take Survey
[...]
If you wish to contact us, please do not reply to this message but instead
visit our online Customer Support section. Replies to this message will not be
read or responded to.

We appreciate your time. Thank you!

One way to tell whether something really is extremely valuable or not is whether they're willing to share a piece of that extreme value with those who are generating it. In this case, you will not be surprised that no incentive is offered - no cash, no trinket, no future discount. That is, except for a computerized thanks from an account that does not receive email.

So I gave a review to TripAdvisor instead. Their computers are twice as cheerful.