I was always of the impression that the 18%-22% commission charged to small hotels using an OTA most of it went back into PPC and other online marketing anyway, kind of like a slot machine winnings, hence you needed a lot of cash to bootstrap competition. In this instance paying out to Google meta search is probably no different than a PPC campaign for the OTA, you have to pay to get the eyes. Slightly off topic, I remember a hotel manager bitching about how much OTAs charge and then saying he was going to fund his own site and charge hotels only 5% and make a killing, I'm not sure how far that Joomla project got lol
Back on subject, I don't have too much sympathy if this is deemed unfair, as OTAs are quite anti-competitive too, they force hotels to sign agreements that disallow themselves from running their own promotions or advertising on other sites for anything less than the best rate given to the OTA, and yes this is enforced, in the old days via screen-scraping of competitors.
>Most hotel chains guarantee the lowest rates on their websites.
I've never seen this to be true, even though nearly all big chains litter their website with it, it's always marginally more expensive (with other surcharges etc..) and massively more annoying due to clumsy UI and harsher terms & conditions.