What extra marketing? TMobile sold the Nexus 5 but there were very few commercials for it. Probably wont be many for the Pixel either which is par for the course.
Not to mention MOST people dont want to or cant shell out full price for this phone. Being on one carrier and being limited to get one without a subsidairy price anywhere else will hold it back as usual.
I did a blind poll last year, between all my family, extended family, friends, coworkers, over the course of a few months, etc... Let's say majority of that group is professional adults, earning very good livings, well into the six figure incomes, point being they can easily buy a new iPhone in a blink of an eye on the spot if needed. I would guess that was like 150 people I spoke too over a few months time at parties, holidays, and work.
I asked all of them do they buy their smartphone outright in full, for the $700+ pricetag, or get it through their carrier on contract with monthly payments. Out of 150 people let's say, almost every single one say no frigging way would they ever pay $700 for a smartphone. Even though they are doing that by paying monthly, but they all said hell no no way would they pay full price for a new phone.
99.99% of them said they just wait till their carrier says they are ready for a new phone and then they get one, and continue the monthly payment plan. Out of those 150 people, only 2 were Nexus nerds, and they liked the affordable part of it, paying $399 to be off contract and no contract with a carrier. But they said they'd never buy a flagship for $650.
I honestly do not know one person that would pay $800 out of pocket for a smartphone, and these are people a hell of a lot richer than I, and could easily do so.
My main point, i think majority of the Joe Blow smartphone buying public thinks the same way, 95% of U.S. smartphone users get thier phones through their csrrier on payment plans. So Google selling a great new high end phone for $800 will limit buyers to a very very small buying population. And will never come remotely close or even a fraction of iPhone or Galaxy sales numbers.
This new Pixel line will sell the same as the Nexus phones, very low, and no more, and possibly worse than Nexus sales due to the high pricing.