Are mainframes still useful today?
Yes, they are indeed used a lot. Half of server revenues for IBM comes from Mainframe alone. They have excellent reliability and exceptional performance in certain use cases.
Typically they are used where there are huge Input output based operations such as in Banks, Insurance, Warehouse, Flight information etc.
Coming to cost, it costs millions for purchasing a new Mainframe, set it up and kepp them running. You only purchase the hardware, but licence Software and keep paying for it till eternity.
However the usage is going down, seriously going down. They will be in usage for some more time. Career as a Mainframe Developer(if you want to call it that way) is rather limited.
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