Those of you with two accounts (or more)

I generally sell all Uncommons since they typically go for less on the Market than the 1000 they are worth. Depending on the room available in the base I may keep one of commonly used types around to speed up crafting. Rares, though, I typically hoard since I will want one when I get a recipe that uses it. And when I do get such a Recipe it usually disappears pretty fast.

I just can't afford Rare items to craft. If I sold them, I wouldn't have enough to buy all the Rares I need anyway, so I just hold onto it until it's needed. Occasionally I'll sell something that I know will never show up in the Inventions I usually craft, but that's a hard thing to predict.

Commons depend a lot on the Market. I usually keep them around so I have a good solid base for crafting, and then if I have any surpluses (like 7 or more of the same thing) I will check the Market. If they're cheap I'll sell them, if they're really going for high value I'll sell them, but if they're only moderately priced I'll usually keep them, since it would cost so much to try and buy them back later. Because of market fluctuations I can usually count on what is expensive one week to be moderate the next, and vice versa.

This is complicated by the fact that I have both personal SGs, and an SG I belong to where I am the main crafter. My own base I can fill up with storage items, but I have to be more stingy with the storage space the shared SG provides me. Then again, with email I can transfer some salvage around.

Mmm...

I know it sounds odd, but I keep track of those recipes I craft the most such as LoTG 7.5 < Bleezing of the Zephyr, etc. And store those called for white salvage only. Why you may ask?

Because a certain number of the population likes to horde certain materials and resale them at idiotic prices. Thus charging 100,000 or more for salvage not worth more than 50 influence.

I do not store yellows, I can get them most of the time for reasonable prices at WW, but can always get them at AE by trading tickets.

I do store reds, under the same philosophy as whites. When I run out, is a quick trip to AE to replenish a basic set.

As a rule of thumb, I keep 5 of each key material in storage.

The principal thought is use AE as your source of salvage mainly. If you spend an hour a week at AE harvesting tickets, you may find you have all the tickets you need for your salvage requirements.

Stormy

I used to store a token amount of common high-level salvage that was subject to wide price fluctuation in my characters' vaults. Currently, there's basically no such thing as expensive common or even uncommon high-level salvage. Currently, I only store rares in my vaults. Most of my active characters are 50s, and they have around 80 salvage slots, so if I get some low- or mid-level salvage, I might carry it on their persons, and maybe sock away a 10-stack of something juicy. Mostly, though, I only store commons by accident or laziness.

I never store salvage in my base. My only base salvage rack has old base salvage in it I have retained for posterity.