For me personally, yes. I had gone into debt from gambling and bad financial discipline. OE allowed me to pay off all my debt and put a down payment on a house. Watching "number go down" in rapid fashion was very rewarding, and I wasn't a very active person to begin with so I didn't miss out on as much as a regular person would, being holed up in an apartment for virtually the whole year. But towards the end it had an effect on me, it definitely wasn't sustainable.