Mining XMR with a xeon E5 2696V3 with the trick to gain higher all core turbo (https://forums.anandtech.com/threads/what-controls-turbo-core-in-xeons.2496647/) gives around 950 h/s, which is higher than most video cards excepting the new RX vega: around 2 $/day depending on xmr/usd rate  and network hashrate...
I have gained more with mining some coins with new algo the few weeks after launch (before gpu mining ).

Believe me it's not worth it, you will be burning money essentially. If you wanna do it for fun just try, but beware that some providers will terminate your account if you max out the cores to mine. Read the terms of service first!

Profitable as in making money off un-utilized processing power, but not as in worthwhile firing it up to mine.
Like previously said, even dual socket modern server likely wouldn't pay for power costs.

Can do but just for fun. Running multicore Xeon CPU, latest of E5 V4 series as example just getting cents daily...

You can try Bittrex. Im trading there for months now. Not encountered any problems. And i think it's a decentralized exchange which don't require you to submit any documents for your identification in able for you to trade. You can try also Bitsquare. Same also with Bittrex. Decentralized exchange. But beware with decentralized exchange because government can easily make it not operational. That's why we rarely see these kind of exchange. They are good tho. I just don't know what's the maximum withdrawal there. $100 is a good start. Waves is good buy these days. Check it out.

Anyway, centralized exchange platform are more secured than decentralized exchange because  it is supported by government. So traders prefer centralized exchange. Besides, most of the exchanges are now implementing this system. You can still trade to centralised exchange without submitting your IDs. You can do that on Polo. But if you want to maximize your deposit and withdrawal limit. You can level up your profile by verifying your identity.

By identity info I'm guessing you mean bank accounts, driver's license/passport, even phone numbers?  You don't need any of that on any exchange UNLESS you are doing fiat.  I personally use bittrex and poloniex for my crypto-to-crypto exchange needs.  Bittrex doesn't even care if you use a temporary email (yopmail) to set up an account if you don't even want to use your main email.