[c4mden]

As someone previously burned by this business model, let me be the first to tell you how right you are. I built a small business around their SOAP search API some seven years ago, and received a commercial license and increased API usage to bring my product to market.

After easily lining up enough customers to exceed my daily limit, I lobbied for higher usage and a method to share the revenue (they had no structure to charge for API calls back then). For years I tried to contact anyone I could within the organization, but there was no response. After an eternity, they simply shut it down with no notice.

You just never know how long they're going to enjoy experimenting with their APIs, and unless you have a backup plan, it's a deal breaker.