But New Relic isn't necessarily designed to be a tool to save you hosting $ (although I suppose it could). What about as a tool to save engineering hours, and increase conversion rates by reducing error rates and improving performance? Maybe the "worth it" changes then -- especially when you consider that we have a Lite product that's absolutely free for unlimited apps, servers, and request volume -- just limited to 24 hour data retention and missing some of our more advanced/in-depth features.

I work for New Relic, obviously :)