I bought 10 at $46 each and thought that was a smokin deal.
When I used them for a week and saw how good they were I decided I wanted more.
A few minutes after this I got an email saying I qualified for a 'coupon' purchase from my original vendor and the price was now 0.13
BTC (about $17 at the time) so I bought 100
I call this a Wayseer thing
http://www.youtube.com/watch?v=OPR3GlpQQJA, its like the Heisenberg Uncertainty Principle, Chaos Theory, things that will be well understood in 500 years.
ROI? bah, very doubtful, its a hobby and I'm enjoying it. People need hobbies.
Is it worth buying and selling to make a profit, nah. You can make a bit for sure if you hussle but there are far easier ways to make money.