Valid point. Most gamblers are newbies who don't know much about RTP and other technical stuff and just proceed to play wherever they want without thinking too much which is why this RTP promo wouldn't really pique their interest.
On the other hand, it would definitely pique the interest of experienced gamblers like me who would try taking full advantage of it.
It's same with investment in a best and safest cryptocurrency, Bitcoin. With
98.85% days are profitable but it doesn't mean all Bitcoin holders can get profit. It depends on how long they hold their bitcoin, their entry prices and exit prices too.
The market is zero sum game and in gambling, there are winners and losers but not only this, money will go to the host: online gambling sites. As companies, they must have good business revenue and positive net profit so that their business can run sustainably with time. Gamblers fight each other or fight against the casinos and game providers to have profit through their long betting period.