Mining to pay for your account, so you can mine more, is a self defeating loop. But if you enjoy it, go ahead.
Generally 100,000m3 ores/hr is around 60M ISK. Double that if mining rare moons, but the popularity means you don’t get to moon mine that often, so the rest of the time is chasing Ytirium Blue A0 spawns (RNG), while the reliable will be Mercoxit.
But due to the Mercoxit crystals burning out like crazy in the recent patch, it eats into your profitability.
2 Hulks + Porpoise boost with good skills & T2 B crystals, you should be pulling in per hour (factoring in crystal cost, refining taxes etc):
600,000m3 for Ytirium or Dark Ochre = 360M/hr
500,000m3 for Mercoxit = 300M/hr
More if you invest in Abyssal lasers but they can be quite expensive, and its a lot of ISK to risk on grid.
Is that income good? IDK, I make around that much running combat abyssals (almost risk free, biggest risk being disconnection) or solo relic/data exploration in a cheap fitted Buzzard T2 Frigate, and I got fast align time, covert cloak, warp bubble nullifier & warp core stablized.
If a neutral or red comes in local, I can just leave & continue elsewhere. If you were to sit in an Ore Anom with Hulks, you have to warp out and stop mining.
Mining is one of those activities that is pointless to do solo account, and even 2-3 account is not that rewarding, but I have seen guys with 10 accounts, and now that’s big league ISK/hr. It’s basically go balls deep or don’t bother.