I think today mining now has low profit. but if you want to work for long term, it may have some profit. Graphics card prices are not at all affordable, and no one will be able to profit from any major hardware manufacturer. This process will lead to a major crisis. The graphics card crisis was unpredictable, and never happened on this scale. It seems Nvidia and AMD will not be able to produce this volume of graphics cards, and even if they can, the application for Series 4000 and 500 Series cards and the Nvidia GTX 10 series will soon be reduced, as these cards will no longer be profitable. So they will lose their popularity among miners.
an other side i suggest you to before u make a rig, make solar panels to get more profit. also I suggest you to read below link for more information. in this link you can find some thing about ETH rig https://cryptosrus.com/ethereum-mining-rig/