For you first point, this is exactly inline with the actual question. We can calculate top DPS - but what % of top DPS is considered still a DPS toon? If you are saying that you need to be within 2% of the top DPS build to be considered a DPS build; then as per my initial discussion, you are exactly what this post was targeted towards. It doesn't make sense, to my commonality, that 98% of the melees on a server are not considered DPS builds - esp. when they certainly are NOT AC builds.
If you drop the threshold to 10%, then it is entirely possible for a well built monk to make the grade. If you use the definition that a couple folks have mentioned (i.e. what is the build's focus), then we are looking at builds probably 30-40% below max DPS still making the line to be considered a DPS build. If we exclude equipment, then we will definitely see characters below 50% being considered DPS.