Quote from Tide31:
I am starting to think you actually do believe there is a human you are interacting with, a Market Maker, that works 24 hours a day seven days a week servicing your demo account. Why don't you try World of Warcraft and spare your 'fellow traders' this pain. I am convinced you're either at an asylum and they give you internet access, or you are 11 years old. There can be no other explanation. :-(

BTW, everybody can make himself a MM of a stock if he has enough capital and knowledge. The MM buys a big number of shares when the price is low, and deals with it for a profit, ie. the usual biz in the markets, buy low - sell high, and repeat...Quote from traderum:
FYI: there are many market makers, I think most of them handle just one stock and its options, but I can also imagine that some MMs do handle more than just one stock.