do you prefer that a casino offer loads of promotions and campaigns and sponsorships and sacrifice RTP in favor of that.... or will you rather have a decent gambling experience with a better RTP?
As far as I know everyone who tries to play on a slot machine, the first thing they pay attention to is RTP, usually slot players always prioritize and pay attention to the RTP level on offer, if as you say a gambling site sacrifices RTP for campaigns, and reduces the total payback in slot games it will be bad for the site.
I'm sure many slot players are looking for other sites with higher RTP levels, maybe I myself don't agree with sacrificing RTP for campaigns, as I said above, generally people always look for and choose the slot that has the largest RTP they know the chance of profit is greater, rather than reducing the RTP value, Should, the gambling site, have other alternatives than sacrificing RTP.