I suppose what we're dealing with are two different economies of scale. Both companies get their primary revenue sources from different places. For Google, it's primarily their advertising and data mining empire. For Verizon, it's whoever pays into the network (customers). It's a long debate I'm not in the mood to start, but considering Verizon's FTTP network is much larger than Google FTTP currently is, and considering in some areas Google bought infrastructure for $1 whereas Verizon had to build from scratch, that should start off the perspective of why things are more expensive.
Also, slow Wi-Fi is not the fault of Verizon. Realisitically speaking, Wireless networks would perform much better as a whole if everyone wasn't shoving everything onto them. Run some cable, or make use of existing cabling, and get what you actually pay for; a wired connection.