Hmmmmm.
Average rakeback tends to be 30% from what i've seen so a decent rakeback would be 40%+ at a guess.

And that is as much as I can answer as I have no idea how many games you play to answer the other 2 questions. I think I heard someone say 3bbs an hour is a good rate but that's just $1.50 per hour so I must've got that wrong.

I shall guess though, at quite a lot as you play at twice the level I do and you play 18 tables versus my single table - and I would average $50. 75000/18 = 4167 hands per table. 4167/60 = 70 hands per hour per table.

I don't know but shall take a wild stab at $2000. Note there was no maths involved - just guessing. I suspect there is a lesson to be learnt here but I'm missing it