Please help me understand today's tablet craze?

I got my tablet because it is an HP Touchpad and I got it for $99 and it works fine for what I use it for. I like to put it my purse when I am out and about because it is easier to read e-mails, web pages, Facebook etc. than on my smart phone. I had a net book but it was too bulky to lug around and a tablet solved that problem. I would love to get a 7 inch tablet one of these days.