What Are The Average Monthly Costs For Website Marketing And Search Engine Optimization?

I want to start a website that will be a tool (like facebook, wikipedia, etc) and my brother tells me that it will cost 10,000 a month to advertise, market, and search engine optimize a month. From everything I have read this seems way off base…can you provide some insight into this for me?
Thanks!

What Are The Costs Associated To Running A Web Based Business, Such As Costs For Traffic Hosting And Software?

I want to start my own internet business, which in order to be successful must have high levels of traffic. I have never had a website before, am I correct in thinking that traffic above a certain level must be paid for extra?How much does this cost, roughly? Also in order to create a proffessional [...]