you want to ruin the experience by popping ads every 5 seconds, fine. But having to click 5 times the "x", ">>" "->" to go back to the app, especially when the buttons are 2x2 pixels big, is absolutely frustrating. at that point I forgot who I was talking to.
Also some people need to keep this app private. personally I keep my phone in vibrate mode and only open the app in discreet places. there are ads that just start playing sound even on vibrate mode WITHOUT a mute button. this is a major problem for people who want to be discreet.