Finding revenue sources to me equates to finding new products and services consumers are willing to pay for. Not finding new "creative" ways to charge more and take more while providing less and doing less, just because they can.
I used to be interested in Femtocells but they've been largely obsoleted now by Wi-Fi. I don't need one at all because I can use my phone and other devices via Wi-Fi and make voice calls via Wi-Fi as well, so there's no longer a need for a Femtocell.