Dropbox, Flickr, Apple, etc-- all sell to consumers with a high ARPU. Also, cell providers, insurance companies, car companies, etc.

Good rule of thumb-- anyone who advertises heavily to consumers has a high ARPU.

Dropbox is probably the best example for an app that scaled charging consumers

Sure it exists. Have a services that is free to use but includes charges for one particular highly desirable function. One example is a game with in-app purchasing of new levels, character wardrobe, etc.

evernote, dropbox, rescuetime, pandora, spotify all beg to differ

yes, you find this quite a bit in e-commerce but agree on SaaS