I agree that it's probably a manufacturing cost issue, but I disagree that a draw that long is necessarily difficult to perform. One can buy extruded aluminum in various shapes, in very thin wall thicknesses, in lengths measured in meters or more. At a previous job, I semi-regularly worked with aluminum angle with about about 1mm wall thickness, several feet long. And note that the length of a typical energy drink is something like 2/3 of the length of a Pringles can.
Now, I doubt an aluminum Pringles can would need 1mm wall thickness for sufficient strength to deal with the usual rigors of being handled by a minimum wage shipping or shelf-stocking employee. However, I will concede that something with say, the typical .01-.02 wall thickness of a soda/beer can may be harder to produce with a workflow of cutting can-lengths from a large piece of extruded stock. Depending on how the stock was cut, you risk crushing it. At that thickness, you'd do better to stamp the final can size & shape from crude blanks. Now, at high enough volume, it could be worth it to in-house the can-stamping operation; beer companies are an example. I could see Pringles having enough volume to justify in-house production of their cans.
But I don't think a .01-.02 wall thickness would be enough for a Pringles can. Yes, soda cans are strong enough to endure shipping and handling, but most of that strength comes from the fact that their contents are under pressure; significantly moreso than a pringles can, I'd bet. Witness how easy it becomes to crush a soda can once it is opened, even when it is still partially full. So .01-02mm wouldn't do. I'd guess .1-2mm would, however. But at a 10x wall thickness you're using 10x the material if my math is right, so an all-aluminum Pringles can with a .1mm wall thickness would cost at least 10x to produce as a soda can of equal length.
So yeah, manufacturing cost issue is probably at least one factor. But I'm willing to be wrong about that.