I spend about 3,5 times more money on fuel than tires. A rear lasts for about 5-6k miles, a front tire some 2k miles more. Pirelli Angel ST mostly.
I can tell you the numbers, but they'd be useless for those across the pond:
bike has 62500 km or 38800 miles
I spent 6478€ or 8400USD in fuel
I spent 1890€ or 2450USD in tires
I spent about the same as tires and fuel in services, taxes and insurance; about 16400€ or 21260USD. That's 4 years use, 9 months of the year, so 36 months. That's 455€ or 590USD a month. Plus the value that the bike loses every month.
And there's nothing else I'd rather do with that money