Another thing I auto-ignore on steam for is when the game requires a 3rd party account. ie: an Xbox Live account as just one example. If I have to log into something else to play a game, I'll just buy it on that other service directly (Assuming I'm already signed up for it and give a damn about it.)

I may have an Xbox Live account from my 360 days, but I haven't logged into it for literally 5+ years. So while I'll auto-ignore it on Steam, I'm most certainly not going to bother getting it on Live either.