[bootlooped]

I think that calculation omits a critical number: how much data you actually use. If you pay for 50GB but only use 5GB, your price per GB is effectively 10x. With Fi you will never pay for more than 10 / GB used, but you will pay less if you exceed 6GB in a month.

[butisaidsudo]

Further, you don't pay in GB "blocks". I used 1.021 GB last month so I paid $10.21, instead of $20 like you may expect.