I'm surprised to see this pick up again... I mined 800 usd in 24hrs on a 4-gpu rig last weekend. In retrospect it was the perfect sweet spot of low difficulty and high price and I doubt it will happen again as the difficulty is coming up fast now. But it shows that interest is rising, that's for sure.
I was there pretty early on and remember it trading for multiple btc at the time. Not sure if that'll happen again given the current btc price. But hey, most things that happen in crypto seem unbelievable at the time. So who knows really...