Save for maybe 2-3 servers, no one even needs a server cluster or mega server. A single core, single hdd, 2-4GB ram machine will run pretty much any server that exists right now. You can handle around 40 people reliably with 1 Mbps bandwidth.
Your best bet if you want to help out is to do like Akkadius and offer hosting for people.
It's really not very intensive.
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