Wireless pocket charger good idea? Can you charge a battery through Jackstick/AUX?

So I'm doing this project in school and we have to come up with a new invention / product. Our product is a wireless pocket charger, and I want your opinion.
The idea is that you're going to have our product sewn into your pants (supposed so be already sewn in when you by a new pair of pants).It consist of some sort of joint around the knee, and two stiff "sticks" on your lower and upper leg. When you move your legs you create energy in the knee joint which is converted into an electric current (kinda like the lights on your bike) which then runs through a wire to a small battery in, lets say, the backpocket of your pants. The battery is then charged through your movement. The battery runs an induction magnet in your frontpocket which, when placed into the pocket, charges your phone. Its green and economic.

Of course the phone has to support wireless charging.
Phones I know support it:
Nokia Lumia 1020, 925, 920, 822 and 820.
Google Nexus 3 and 4
And I believe Samsung Galaxy S3 and S4 is also supported.
You can also buy some covers for iPhone 4/4S and 5/5S which makes it support wireless charging.

If you would quickly answer these questions it would be great:-) (set x )

Age:
Gender:

Would you buy it?

If no, why?

How much would you pay for it (In Dollars or Euros)?

Ps. English is not my main language so I'm sorry for bad grammar.
PPs. Copyrighted.

No.

For it to make useable power, it would take more energy from my motion. Induction charging (not truy wireless) would take some part of that away.