I have a few interrogations with the new salvage thing in the gemstore. It gives more upgrades than the Silver-fed Salvage-o-Matic, while only giving 5% less rare materials. But it only costs 30 copper on use, half the price of the Silver-fed kit.
The difference in on use-cost between the Silver-fed kit and the Copper-fed kit was understandable, as the later has mutch lower salvage rates (likely its purpose is to be used on lower-rarity items while the Silver-fed was dedicated to yellow+ items). But here the difference between the Silver-fed kit and that new Runecrafter's kit is so low, I find it hard to justify it being half as expensive.
So, let's say I only salvage rare items with the Silver-fed kit, is there any reason I shouldn't use the Runecrafter kit instead? If no, why even create a gemstore item that renders another gemstore item obsolete?
[Edit]: Copied some answers that better clarify my interrogation:
If the Runecrafter's kit only has 5% less chances of rare materials, while being half as expensive and recovering 20% more rune dust, is it still worth using the Silver fed kit if you just want to sell everything and get the most value out of it?
Is 5% chances of rare materials, worth paying twice as mutch on use and losing 20% of rune dust?
What is the advantage of the Silver-Fed? It gives an extra 5% chance of salvaging "rarer materials", a 20% less chance of salvaging upgrades, and costs twice as much per use. What are these "rarer materials" it speaks of? T6 materials instead of T5? Does the extra 5% bonus in gaining them outweigh the 2x cost per use and the loss of 20% salvaged runes/sigils over large numbers of salvages?
[Edit]: A lot of people seem to have misunderstood the tooltip of the Runecrafter's Salvage-o-Matic and to regret their purchase. I personally advise really considering every parameter (salvage rates, costs, and how you plan on using each kit) before doing so, but you can get a full gem refund by contacting the support.