The Market Demand graph serves as a data point for potential sellers to view the total amount of indications of interest by IPOGO investors in a given company. In other words, Market Demand shows investor sentiment, rather than explicit open buy orders.
One way a potential seller might utilize this data point is the following: Jane wants to sell her position in The Awesome Company that she invested in through an IPOGO fund. She wants to sell at $10.00 per share. The Market Demand metric shows that there is $200,000 worth of investor interest in The Awesome Company. Therefore, Jane might aim to sell up to 20,000 units rather than 40,000 given the known investor interest in this company.