22 apps after today.
Ad based apps - I use a combination of admob (banner ads), revmob (popup), leadbolt (notification) and startapp (exit ads) depending on the app. I have been phasing out revmob as it caused a lot of bad reviews. No idea why but my users hate revmob pop ups but dont hate the others so much.
Paid 99cent apps - google wallet (was google merchant)