As to Godzilla's earnings...
ANY new pinball that is even modestly playable will generate the best money that you have at location.
People are starved for something new, and they flock to the new machine. So the new machine is always the best earner with the exception of established crowds (Jeff, Tom, and Harry pretty much only play Addams Family, and they spend five hours a week playing pinball. These kind of stories are fairly common...)
This factor is so well known that back when three manufacturers were producing three to five new pinballs a year there was an informal rule to never leave a pinball at location longer than a year. Any pinball you brought in that was new to the location would provide a significant bump to your earnings, so you rotated equipment frequently.
This isn't possible in a pinball scarce world, but in my experience it was the way to make the most money through the cashbox... rotate something new in as frequently as possible.
So... the new hotness (Godzilla) is going to be your best earner until you bring in something newer. If Godzilla proves to be one of the best of all time pinballs, it'll STILL generate less money than something newer... for a week. Then it'll rise to to the top again and again. That's the value of a top-tier pinball.
Tampa12's excellent listing of earnings on pinballs match my experience, but of course location, location, location. Top tier pinball isn't going to make top tier money unless it has a prime location.