Markers should lie flat.

Almost all creators use markers to some extent in their work. I have complained bitterly about expensive tools like Copics which many creators have chosen to use for commissions. 

Copics and sharpies are not lightfast and often fade in a relatively short period of time. If you get a commission or an autograph using these materials, your art sometimes fade so badly it will be completely destroyed. Some art I did when I was a young pro is lost forever.

I've spent the better part of the last decade diligently testing various markers and their qualities.

One of the things that drives me crazy about marker manufacturers is they sell these marker holders and caddies which stand all your markers on end and make it easy to find and use your colors.

What they don't tell you is that markers should be stored flat. If you don't, they will dry out faster as the color rushes to the end of the pen and the tip deteriorates. If you're using an alcohol based marker, the solvent in the dye retards this process for awhile. However, you shouldn't be using alcohol based markers in the first place, because they are acidic and not lightfast.

The more pigment heavy your marker, the more likely it is to dry out and to develop mold at the tip if stored improperly.

So, if you have one of these cool marker storage caddies, great! You have a nice kit to show off your marker set. But the more you use it, the faster your markers will deteriorate.

If you get one of these these caddies, store it on its side when not in use.

Even though many markers are advertised as permanent, there is a difference between a permanent mark and a lightfast mark. A Sharpie will leave a permanent mark, but it will sometimes color shift to brown or green, and it will seep and harm your paper. You should never use a Sharpie when getting an autograph and always request a commission be created using lightfast materials.

I just dropped another $50 on acid free metallic marker pens for my next autograph session. I could get cheap Sharpies, but they are a rip-off to my fans. I've got Jodie Foster and Colin Farrell autographed photos here in my office that have already faded to almost nothing, and I've had them for only ten years.

Archival quality writing tools are more expensive and take longer to dry. Don't close a book or touch it until the autograph has dried thoroughly! However, if you get an autograph with the right tools, it should last more than a lifetime.

This marker rack does the trick. 

It comfortably holds all standard sized markers, and it's very affordable.

One unit will hold 72 markers. You can stack even more units on top.

You can also get it in black (which I prefer,) or go all out and get this larger unit which holds 176 markers for less than $75, which is cheaper than buying several units separately. It doesn't come in cool black, but it sure does the job. 

Not portable, for studio use only.