Except the majority of Android phones sold have small screens and are cheap, this can easily be seen by the pitiful amounts of money Android vendors make and the absence of high end large screened phones using the web.
The vast majority of Android users don't have 5" phones.
No that's not true. Profitability has nothing to do with what type of phones are being sold. Device margins, on the other hand, could provide that insight. I don't know where you saw what size of screens are using the web.
DED recently wrote an article that said that the S4 and Note combined to sell 2/3 of the amount of iPhones Apple sold. All the other brands' flagship phones are 4.7" and above, and the midrange phones are generally 4.5" and above. It's not reasonable to say that HTC, LG, Motorola, Sony, Samsung (in midrange sales), and all the other smaller brands are not more than making up that remaining third of iPhone sales in large-screened devices. There are FAR more devices sold with screen sizes close to 5" than close to 4".