I know some of you don't like the hassle of the AMD GPUs... But I must say my two rigs of RX 570's are still going strong today, mining ETH+Blake2s and have earned their cost many times over since April.

Now that stock is back in those GPUs (albeit at a higher price), I was wondering if it would be a good idea to build a couple more rigs... or if the reliance on ETH (and the risk of it going PoS) is getting too hot to handle...

At around $350, those GPUs are still a lot of bang for the buck compared to anything nVidia currently. Sure, one would have to flash the vbios, but today, these low-timing vbioses are widely available and support for multi-GPU is a lot better than it was early last year. It would be a formality to set up.