My steam spendings are like R8000 total over a period of 7 years, so just over R1000 a year. However, I spent more than that basically every single month on games from 2009 to April this year, while I was working at BT Games. It’s really hard resisting new games if you’re surrounded by them all day. 
If PSN had something like this I’d also probably get a huge scare.