Google Metrics - increased cost = good metric

Advert test
Just blogged about something I noticed on Google AdWords - when the cost per conversion goes down, the metric is green. When the CTR goes up, the metric is green. If the number of impressions goes down, its in red - i.e. Green = good, red = bad.

For some reason, regardless of the other metrics, an increase in spend is also written in Green (you may be getting more conversions for example for less money but if spend less doing so - it's in red). :confused:

This is just something I found curious and slightly funny! :D