Nexus One, very expensive when launched. Limited network availability. Didn't sell many.
Nexus S, expensive when launched. Limited network availability. Didn't sell many.
Galaxy Nexus, very expensive when launched. Price was cut after a few months (though was still higher than the Nexus 4). Limited network availability (in the USA the Verizon model was a dog and they launched the Sprint model just as it was about to be replaced.)
Nexus 4, inexpensive. “Le Beaujolais nouveau est arrivé!" moment for geeks like me as we wouldn’t have to splash much cash. But limited network availability. Didn’t sell many.
Nexus 5, see Nexus 4.
None of these phones sold in any great number. The most popular was probably the Verizon Galaxy Nexus – because it was on Verizon subsidised through a contract. Now the normal reaction to any contract involving the Nexus 5 is “don’t buy it that way, buy it outright and get a cheap sim only deal”. It is certainly what I do. Most people don’t do that though, they don't want to spen £300 outright. They think they are getting a free phone (or in the USA the phone costs $199 instead of $649). The Nexus 6 is available on the 4 main US carriers plus US Cellular. That is massive. It will sell in larger numbers than the any other Nexus if they market it properly. If they get it on all the UK networks it will be a big success here as well. Google have said themselves that they expect to sell more by doing this as it is what the normals want. The very fact that we are taking the time to post in a mobile forum shows we are not the typical phone user.
And they still have the Nexus 5 for the devs which they should knock £50 off imho.