> I can't begin to imagine the thinking of someone who keeps all their photos on a single vendor's system
Quite a few assumptions you are making here.
I have all my photos since 2003 backed up. But I didn't keep track of all the sets I shared with people over a decade (I'm wiser now), and selecting the photos to present to other people takes a long time for me.
>A 'devoted user' that doesn't pay for the service
By that logic, there are no devoted FOSS users, no devoted redditors, etc. And as SmugMug said: I was paying for the service with my data. Now they want me to pay with money, and I am OK with that too.
>doesn't read the emails they send
...they didn't even send any. I assumed the fault was on my part; it was not.
>and logs on at less than 3 month intervals?
My usage pattern is intermittent periods of heavy usage, and that has been consistent over the past 10+ years. That is why I call myself a devoted user; I've stayed with them through Yahoo! and SmugMug acquisitions, and haven't shared photos with anything other than Flickr in the past 5 years.
This is the point I am trying to communicate: devoted users aren't just the ones who use the service all the time.