I put seeds for sale in the marketplace. Why has no one has bought them yet?

The system will only match buyers with sellers based on the same number of seeds selected by each (100, 500, 1000, 5000, or 10,000). For example, if someone places an order to "sell 500" seeds, the sale will only take place when there is a some who wants to "Buy 500" seeds on a first in, first out basis. If they put a high seed amount and no buyer try a lesser amount.  As the lower the amount, the larger the number of buyers.