Hey Joshwa, thanks for the tweet-vite, I'm glad to share.
Etsy is successful, ultimately, not because of some putative secret sauce (though we do have very powerful and unique behind-the-scenes tech).
We are successful, ultimately, because we are providing tools that support and enable the livelihoods of hundreds of thousands of people, help their artistic and creative achievements be seen and recognized around the world, and subvert the common shopping experience people have to add a personal connection to the creators of the goods they buy.
If anyone were to identify a similarly unmet need, another ignored and under-served community, and created a place online that had a positive impact on the lives, they would also succeed. What "business model", which metrics or revenue streams make sense, depends on that community's characteristics, and it doesn't have to be complicated or some sort of trick.
That all said, it's of course crucial to have reliable, flexible, scalable, rapidly evolving technology behind you. I have been working here relentlessly to get our team to the point where we are free to innovate as much as we can. To be honest, there is already abundant information on the web and elsewhere about what works, and what doesn't; it's not really a mystery.
But you need the resoluteness to actually execute on these best practices, and the courage to innovate even in the face of occasional mistakes.