Everyone should be concerned. For the most part permissions are benign and used by developers to determine what kind of advertising to send to your machine. There have been a few apps that were downright evil. Fortunately, they were found pretty quickly and removed from the play store. Google can also remove them from your Android device.
If you use Android software, I recommend that you closely check the permissions that programs request before you install them. This is especially true for new software on the market. Some of the permissions that could cost you money are:
a) Make Phone Calls. This could allow an application to call a 1-900 number and charge you money.
b) Send SMS or MMS. This could let an application send a text message on your behalf, and much like the phone call feature above, it could cost you money.
Other permissions could allow a rogue program to steal your personal data or make changes on your device that you don't want to happen. Examples are:
a) Modify/Delete SD Card Contents will allow the application to read, write, and delete anything stored on your deviceís SD card.
b) Read Contact Data is extra scary for me. Unless an app explicitly states a specific feature that it would use your contact list for, there isnít much of a reason tor you to allow it.
c) Full Internet Access could be the most important permission you will want to pay
attention to. For any malware to truly be effective it needs a means by which to transfer data off of your machine. This is one of the settings it would definitely have to ask for.