So after having some looks at bitcoin mining and setting up nicehash on my pc (single gtx 970) to have a look at how it works (ofcourse I won't be able to make any profit because of power consumption), I wondered if buying an Antminer S9 and starting to mine at home with a powercost of 0,26$/KwH would be profitable or will I just lose my investment.
maybe you can reach profit with Antminer S9 but my advice is you can use your gtx970 or the newest vga card. with vga card, actually you have more option to mining coins and you can move from one coin to another coin and you can expect more profit. maybe you can try to solo mining for one coin and see if its profitable for you or not because some people get their luck with solo mining.