I'd have to disagree with this as well
On my Synthweaver and Armormech, I have over 500 Purple schematics each (yes, I counted) that cost me a couple million credits each with over a year crafting and RE'ing.
Purples are rare for a reason and would no longer be "rare" when everyone and their mother had the schematics.
The really rare ones are those that start out as Blue Prototype schematics.
RE'ing the 1st Tier Purples to get the 2nd Tier Purples takes stacks of Purple Mats, to get all 5 of the Critical and Overkill schematics, and all 4 of the Redoubt schematics.