This was the August 2015 answer of Daniell Sonesson on Quora for the price of it:
This always changes. See below prices as a base.
A) Silver cost 8 200 Euros
B) Silver+ cost 16 200 Euros
C) Gold cost 24 000 Euros
E) Platinum cost 55 000 Euros
This is what Linkedin tells about the Career Tab:
Strengthen your employer brand
Get potential candidates on board with your mission, values, and vision with dynamic content based on their profiles.
Engage candidates with personalized content
Harness the power of LinkedIn data and deliver personalized web experiences to your target audience.
Build awareness and brand at scale
Expose your talent brand to LinkedIn members whenever they research your company or view your jobs.
The core message from AJ Wilcox, who is a Linkedin Advertising Junkie (as he calls himself):
"Probably really good for large companies that hire in mass. It’s a lot of money for anyone else, it looks like."
And if this also has a variation of prices, depending on the goodwill of your Linkedin agent, than that is quite pointless to think about paying for this service, if you are as one, wishing to hire few, but if you have 2K position yearly, I recommend you to have. And don't forget about the content marketing.