Well, if the Nexus 7 is a toy, then I got the wrong item. Yes, a tablet can quite easily be a toy, the Kindle is mostly toy in it's structure. It's meant almost 100% for entertainment. The Nexus 7 (and Samsung Galaxy, and a couple of others) are not 100% entertainment geared. In my opinion the OP is trying to take a usage statistic of current owners of tablets like the Kindle, Nexus, etc and build a strawman's argument with it. Yes, they can be toys, but most of them can also be very useful tools. I'll use myself as an example: I just got a Nexus 7 due to my failing eyesight. I am not going to nor desire to use it for entertainment as it would be useless for me to use it in that capacity. I'm using it as several things:
1) A remote for my Logitech Squeezebox Touch (which is the same price as a tablet, but it's a one trick pony and could also be called a toy). That said though, it's also a huge money saver. Saved me $160 the minute I took it out of the box). Why am I using it to control my Squeezebox? I can't see the screen until I'm on top of it and that's with glasses! With the tablet I can control it from 10 feet or what ever. I have narrow canal Gloucoma which is untreatable except buy super expensive surgery so eventually I won't even be able to read a book.
2) Portable databases. No more having to print out databases every time I update and take all this paper with me. I'll have it all at the touch of a screen and be able to work with it to boot, all at point.
3) I prefer printed books for reading, but in future I may need the help of a tablet for that via either enlarged font or audio reading.
4) Probably many more uses other than entertainment as I learn.
So for people such as myself, it's a very useful device and the Nexus 7 being a true Android device, untethered to a particular eco-system, makes it all the more useful.
So really at the end of the day everyone's mileage will vary. We all use tablets for different reasons. Those who don't want one don't have to buy one, but they should also be considerate of those who feel one of these tablets helps them in some way. If I wanted a smart phone, why would I 1) run out and get a wi-fi tablet and 2) come into a forum geared to the use of such tablets and start calling tablets useless expensive toys in an attempt to appear superior to those who own a tablet?
Just doesn't make any sense to me and is an incredible waste of time and energy.