I made a similar promise to myself after working out I had around £1k worth of games I hadn't even played. I'd just accumulated them over years and years and years. I even started a blog to chronicle my playing through them for a minimum of eight hours, or until completion, whichever comes...
Started yesterday at 6pm. I managed to restrain myself until just before this creating this thread.
I was hoping it would drop to £20 or something because £49.99 is a lot of money but then seeing I could get it for £29.99 and also get Xcom2 essentially for £1.15 cinched it for me.