It means that people are willing to pay for apps. As with any product endeavor, success isn't evenly distributed — a small percentage of developers ("small" or

It means that people are willing to pay for apps. As with any product endeavor, success isn't evenly distributed — a small percentage of developers ("small" or not) are making interesting and/or useful apps that have achieved product/market fit. The rest follow Sturgeon's law and/or don't know how to find their audience.