like i said, to compare designs you must find casinos with similar bonus schemes because yes, the free money is going to get many more conversions than not. so you can’t compare the design of a casino giving away $20 to try for free, to a casino offering a 20% bonus.
just from my experience and shooting from the hip, I think Allslots has about the best of both worlds. they offer buy $25 get $100 so you cut out the absolute total free money hunters but still turn as many real depositing heads as I imagine the free money offers bring in.
The one downfall I see with that offer is it doesn’t have much to offer the high roller. I’d have a second bonus for high rollers plastered right there for all to see.