Alexis Ohanian has talked about what made Reddit successful many times. Steve Huffman is talking about the technical side of things. It doesn't come off as bragging to me at all.
Scalability stories are generally interesting, as they're about solving problems that out-of-the-box commercial software doesn't. They're interesting to hackers, not all of whom are entrepreneurs.
If you'd like to share a story, however, on using statistical techniques to measure and act on virality, doing multi-variate testing, et al that would be very interesting.
I just think we spend too much time talking about scaling and not enough time discussing virality.