How much does unlimited bandwidth really cost?
What hosters/hosting provides it?
Is this what colocation is for?
How much is 20MB up & down?
>>62015715
There's no real price for unlimited bandwidth. ISPs still have to pay for every MB. It's all about the average consumption by users, $/MB, operating costs and profit margins.
>>62015765
ISPs don't pay per MB, they have mutual peering agreements with other ISPs and backbone providers. Read about peering agreements and how BGP works.
For 1U server hosting, is it rare to find unmetered transfer?
Data transfer cap is at 20 TB. That is a constant 8.48 MB/s for a full month.