Sounds fishy. You can literally just buy it and sell it on bitstamp for a decent profit. Why is the OP sharing it to us if he's already making a ton of profit? 

Well, it just sounds too good to be true mate But PM me the details, I'm curious.

PS. Tried that link, but you were off.

Bitcoin is not anonymous: http://www.bitcoinisnotanonymous.com/

And the OP maybe be offering cheaper bitcoins, as they might be tainted or dirty. Some even advertise bitcoins for its half price (http://rkea452tdivg4kbe.onion.link/). Off course this is scams, so I would careful is someone is offering something considerably below its market value.

How does selling lower than market rate work out for you?

Don't expect much; he literally sends you a referral link and tells you to go buy it from some exchange website.

What payment methods do you accept? How do you acquire the bitcoins? This smells pretty fishy to me, IMHO. Even though bitcoin is anonymous and all, if the bitcoins were scammed, someone could easily go through the blockchain and label a buyer's address as an alt of you.