No software version of Google Mini or GSA!

I like both Google Mini and Google Search Appliance. However, what I don't like is that they're available only as standalone hardware devices. That means, no software version to deploy on one's own servers! And that also means possibly-avoidable increase in costs.

(source)

Why hasn't Google provided a software version? Possible reasons:

1. To prevent reverse-engineering of its search algorithms
2. To provide consistent/predictable and reliable performance
3. To avoid the problem of piracy