You don't lose shares - the amount shown when mining is for the session, but the pool tracks your accumulated balance. You can view your accumulated balance at http://www.groupfabric.com/pool.

The ability to NOT lose your "shares" when you have 7k would be nice. But eh, it's a free version, so it's just a click to start again, right?

Guys, the fact alone that it would run in the background with abilities of course to specify % of CPU and % of GPU we would like to utilize, support of usb antminers, etc, that would be alone enough to go for a paid version. But be careful on the mode of payment. One time payment (perpetual) would be the right way to go. IF you go for annual payment or other, then that means you are introducing operational cost which is added to the cost of power, etc and given the variation of the bitcoin yields it makes business case harder to be built.

We can paid for develop via mine(Example %2 or %3)

Appreciate the feedback Levi! All these features are great.

Quick note - Microsoft adds release hurdles on a per-country-basis once money is charged. The reason Bitcoin Miner is free with ads is to make it as accessible to as possible to people. Also ads fund ongoing development. Assuming continued features and improvements, would you be willing to pay for something that removed ads for a year? If not, what other things would be needed to make it worthwhile (mining reports, profitability analysis of different pools, etc.?)