GPU or CPU is a depreciated product, so if you can't get decent profit then better think twice. But I found the ROI is still acceptable, maybe roughly 1 year or more to earn back your GPU invested.
I bought GPU when ROI was 10-12 monthes. Now it is about 2.5 years. So I don't buy more because I can count. So it's a waiting game as always.
Not really. Sell your older gpu's (if they're that bad) and buy the ones that give the best hash rate when they come out. I'd rather be holding as much crypto as I can right now, in anticipation of a price increase. Might happen this year, next year, five years from now, who knows. Might never happen. Know the risks before you start playing the game.
Has nothing to do with being able to count. Your capital recovery time frame could be reduced in half or less than half in a matter of days, weeks, months. Wouldn't be the first time. I personally want to be holding as much crypto as I can.