I think the "occasional printing will clog up nozzles" affects some printer models more than the others. As a single data point, I used a Canon i9990 for many

I think the "occasional printing will clog up nozzles" affects some printer models more than the others. As a single data point, I used a Canon i9990 for many years. It had a very irregular use -- I would print a few 13x19 photos or a tiled panorama, or an occasional school picture of kids for the relatives. Then it would sit unused for days to months until the next job. And even with this supposedly abusive cycle it ran like new until it completely died one day. I personally had worse luck with image printing services. Maybe the machines are off, maybe the fellow who runs it does not care, but more often than not there is something subtly wrong: either the color is off, or there is a smudge at the edge or some minor artifact. My 2c.