Hardware requirements for BIG mining pool

Hello,

I'm a newbie in mining, and I have some misunderstandings in mining web resources. Why pool sites for almost all alt-coins works so slow and it's a big happyness if works 1 of 5 from ANN post or official website.
For example where are no stable mining pool for SexCoin or InfiniteCoin right now

I have a idea to create big centralised service to mine ANY profitable alt-coins at one place. Something about coinex.pw provided before leave to upgrade. 30-50 mined coins some time same place.
You'll have option autoswitch to most profitable coin automatically (may be several switching algorithms) or choose it by yourself just switching in your account. Why to change mining ports and workers? It's possible to make at server-side for every account.

Also I want to provide additional services for this coins. Like stable Block explorer node for all this coins, information page with custom design and so on.
And service like coincoose or coinwarz to monitor profitability, difficulty and price for all coins with charts.

I'm web developer. with about 10 years experience, so sure I understand what is needed to manage project like this, and I have time and finance for it.

But I don't clearly understand what hardware resourse needed for mining pool, who work for example for 1 000 users at 3 GHash/s scrypt power?

Sorry for my English. I'm from Czech republic.