To me, it's not about how many devices they have and whether that makes sense, it's about the fact that they had spent $200,000, which then generated $5,000 (this year only, don't know how long they've been at it), they had to move to a smaller flat, the guy had to get another job, and then they just had to buy two new iPhone 5s (which are mentioned later on in the article). Why? Can you justify spending that if your income from iOS development is $5,000 a year? That what gives me the feeling it's an addiction.
Now, I assume the new iPhone 5 is so different to the ones before it (screen size) that you have to test for it separately. If I was down $195,000 in a year (or two) and I felt this, I'd buy a new generation iPod touch instead. Or two, if they really can't share the device.
I also look at the picture and I question if they really need 5 computers between them if they only work on the two laptops.
Anyway, my point is not that having X amount of devices (Apple or others) per person is an addiction, if you can afford it, go for it and enjoy yourself. My point is that this couple seem to be struggling financially and cannot stop themselves from buying more devices. I'm trying not to be judgemental, but to me it sounds like an addiction.