I think I put together a decent game with unique play[1], but the paid version gets maybe 1-2 downloads per week. I did this for fun, and never put any effort into advertising, but I think that is about what most people see without a good campaign backing their games. Maybe Windows 8 is young enough that it is easier to stand out though.
[1] https://itunes.apple.com/us/app/ocean-commotion/id518629974?...
I have not had the time to update any of my apps but I'm still passively making around $60 a day between 13 apps on two app accounts. All of my apps are paid (no in-app purchases / no ads).
My apps are mostly educational.
$60 a day of passive income on products I haven't touched in over two years even surprises me.
I plan on getting back into the app game next month. I'm setting aside time to update all of my apps and do some marketing.
I'm stopping smoking today. I plan to create an Android app every three days. Hopefully, I can get a little side revenue coming in.