So if iam understanding right this mining is only to generate new coins so they will that will get into your wallet (the bitcoin economy) at a X rate?
If the above is true then the following statement als must be true.

A static low amount of EURO/USD paid for the Electricity -> 1 BTC -> 15 EURO/ 18 USD  (rounded and based on the current exchange rate)

So at the end you are creating money since you started with a X low amount of USD/EUROS paid for the electricity wich you can turn into Bitcoins by mining them and wich also are more worth in USD/EURO or any other daily life currency then you started with/put in. And 1 BTC is not realy earned by doing some usefull computing calculations wich would be the explanation that you earn money by mining, right?
So where does the money come from that pays you for mining or even better said, pays you for the profit you create for your self? This cannot be the system since then as explained above you would be creating money out of thin air.
And creating money is not legaly possible, right? So at the end the only explanation for that you get money for mining is that somebody pays you the differential in real USD/EURO for mining/calculating nothing  (sorry) ?

So to rephrase my question. Where does the USD/EURO come from that pays your profit you get when mining?