1) It's less profitable. 2) The popup might "break the spell" and frustrate players. They would likely move to more compelling activities. People who are seve

1) It's less profitable. 2) The popup might "break the spell" and frustrate players. They would likely move to more compelling activities. People who are severely addicted to slot machines don't care about winning or losing. They just want to keep the flow. Every distraction is detrimental to the experience.