Rates per million are hard to feel
Three dollars per million tokens conveys nothing until you know that a million tokens is roughly seven hundred and fifty thousand words, or about eight novels.
Converting a budget into pages is the fastest way to sanity-check whether a plan is plausible before building anything on it.
The ratio changes the answer completely
At a 20:1 input to output ratio your budget is dominated by input pricing. At 1:1 it is dominated by output, which typically costs four to six times more.
Set the ratio to match your actual workload before reading the numbers, or the figures describe someone else’s product.