Getting paid for using your smartphone: Would you do it?

Just stumbled upon this link, it says "Smartphone owners, get CASH for joining the Smart M:Panel today!". Its for the UK and US users only. If it would have been like fill a form something I would have thought of going for it, but instead they want the user to install an app which will run in the background and will send information. Now who will be ready to do that. They could be sending anything.

"Of course! You can make some cold, hard cash! After a simple installation, and verification with the M:Metrics secure server, you will be mailed a money order or check for $15 or £15! After that, you will earn $5 (or £5) every month and get paid in 6 month intervals.

You will also be entered each month into a sweepstakes to win great prizes! Imagine getting a check for $30 and then winning a flat panel TV!"

Even though they say "We take your privacy seriously. Read our privacy policy", I would not got for it.