What you’re noticing is very real. Most of the big providers have a pre-set range of RTP settings that the casino can choose from. Hacksaw, BGaming, 3 Oaks, Booming Games, etc. all charge a percentage-based fee based on theoretical loss (Total Action × House Edge).
Because sweepstakes casinos already get hit with additional expenses from things like AMOE, their margins are a little tighter. I’ve noticed it’s generally harder to find sweeps casinos running the maximum RTP settings.
Some games don’t display their RTP, but I’ll put together an example so you can see this firsthand.
I used Le Pharaoh in all examples and screenshotted directly from the game rules on the site
Shuffle.us - 96.35% - Max setting
Acebet - 94.43% - Medium setting
Coinz - 92.43% Minimum setting
One thing to note, there are some sites like MyPrize that have the RTP settings hidden. Anytime I see this, I assume they are running the minimum of 92.43% but impossible to identify on these sites. Most sites display the info on Hacksaw games. Ill show you an example of that below:
Coinz game rules on Le Pharoah ^^
MyPrize game rules on Le Pharoah ^^
Notice how example 2 completely skips over the RTP part? Its hard to say but I would assume minimum settings in cases like this.
We have a list pinned here with all of the reputable sweepstakes casinos. It gets updated regularly but does not show RTP for each site. Maybe thats a future update. Thanks for starting this thread @VHSKid87! Interested to hear thoughts from others on this.