For starters, the RTP (return to players) offered by online casinos is significantly higher than what you find in land-based casinos. In general, online slots have an RTP ranging between 94% and 97%, while slot machines in brick and mortar casinos lie somewhere around 75%. What this means is that land-based casinos have a significantly higher house edge. To put it bluntly, online casinos pay out more money to players.