r9 280x

So my gaming pc has a 1070 in it and I download nicehash and it's getting 59 cents a day. Lol I have a couple of r9 280x sapphire with a mobo 8g ddr3 750psu and a hdd. Is it worth it to get the old pc up and running as a mining rig? There's also several 280x around my area for about 80 bucks so...