Whenever you hear that phrase, "We're all in this together," be very, very cautious. That is what scammers will say to convince you to do stupid things with your money (like buying pumped stocks) and what both hucksters and even non-fraudulent trading gurus will say to try to get their hands on your money.
A Market Maker runs a 'shop' and you buy shares from him or sell them back to him.
The Market Makers act as retailers of shares and display their prices during working hours. The prices may vary (sometimes considerably) during the day, depending on a number of influences. For example, if holders of very large amounts of a share decide to sell (or a combination of a lot of holders of small amounts), then the Market Makers will reduce the price that they are prepared to pay for the share. The converse is true also; if there is a consistent and large enough demand for a share, then the Market Makers will increase the price. Market Makers make money from buying shares at a lower price to which they sell them. This is the bid/offer spread. The more actively a share is traded the more money a Market Maker makes.