One of the things that constantly amazes me at my job is the number of ways that people use WooCommerce. There's over 200 extensions available for WooCommerce on the WooThemes.com site and there's demand for thousands more. So what does WooThemes do? Do we go on a massive hiring spree and build thousands of plugins?
I'm sure we could do that but why? No matter how many extensions we create there's just no way to cover every single use case one of our users come up with. There's also no way we can be experts in every single market. There's thousands of substandard services out there that we don't want to integrate, and there will be problems finding the right extension if we offer thousands. The trick here is to encourage other experts to work with you so that you can create an exceptional product for 90% of your audience and other developers can cover the last 10%. Let your open source project encourage diversity.