IMHO
I doubt there are any traditional bows built today that will be collectible. There are many, many bows selling for well over a grand that sell on the secondary market in "as new" condition for half of their original cost. I don't discount the quality of any of them, but the number of bows being built alone is enough to keep the value from taking off. So, as for Ekin bows being collectable, probably not so much, and I would think Craig himself would agree, but would be happy to see happen!
Now, that being said, the real reason for having different bows from Craig is that he offers so many wonderful models of a tried and true favorite design. His models aren't the same bow with different pretty wood veneers, they are totally different models and they all shoot different.
Examples can be found in the top three sellers on his site. Wesley, Big 5, Tembo. It's not just the number of bamboo laminations, but also the way the lams are laid up. A true Wesley is like a Tembo on steroids in that 4 lams are on the back and one trapped to the belly. The Tembo is 2 on the back and 1 on the belly, and the Big 5 has all the lams on the back of the riser. These all shoot differently mainly because the working lims react differently to each design, and even more, the lengths and weights react differently to each design.
Then look at the models that are assembled in like fashion such as the Cheetah, Halfbreed, Owl, and Wasp. They are 4 lams, (3 back 1 belly) but the different working woods make each model shoot differently. Osage is different than yew, is different than elm, or locust etc.
Then you have the all osage, and all yew bows.
Even the combo wood bows can be laid up different, with the addition of a carbon lamination, or actionboo cores.
Now add three different standard grip designs, three different limb configurations, the addition of tip overlays, and the ability to do things with veneers and custom risers and you get a dizzying amount of options that almost always means that no two bows of Craig's will be the same.
That's why we own a rack full of Hills, but I like the way you think!