You sounds like you are new to shrimp, or at least new to your exposure to Crystal Red Shrimp (CRS).
There are a few reasons CRS can be much more expensive than things like Red Cherry Shrimp (RCS), Yellow shrimp, etc.
First, CRS are "softwater" shrimp, that is, they require soft, acidic water to thrive & breed. Since the water that comes out of most people's taps is alkaline and relatively hard, this means that for the most part you can't have an aquarium filled with tapwater and use that to breed CRS. You need to use distilled/RO water and put it over a substrate that softens & acidifies the tank, something like ADA Amazonia. That's a lot of work that not a lot of people are willing to undertake. Shrimps like RCS, Yellow, and Blue Pearl on the other hand prefer alkaline, harder water...so they are perfecty suited to tanks where people use tapwater and any ol' substrate they wish. Thus, a lot more people are going to have success with things like RCS, which drives down their price, as compared to CRS where you really only see specialty shrimpbreeders breeding them.
Secondly, even if you DO set up the proper pH/hardness conditions, CRS (and especially the higher grade ones) are still a much more "delicate"/sensitive shrimp than RCS and the other hardwater shrimps. CRS are just very, very sensitive to water conditions so breeding them is just not easy. Which again, supply & demand kicks in here. The fewer people who have success breeding them, the lower the supply which drives up the price.
Finally, unlike most other shrimp, CRS exist on a distinct "grading scale", which goes from C (lowest), B, A, S, SS, SSS (highest). Here's a
good article on CRS grading, complete with pictures. CRS of the lowest grade can go for as cheap as $2-3 each. Those of the highest grade I have seen go for as high as
several hundred dollars each. Each! Even the lowest-grade CRS are pretty nice looking, at least to me, so if you are interested in them I would definitely suggest getting some of those first, if nothing else than to be sure you have tank conditions that the CRS are happy with and breeding in. Once you establish that, you can always consider investing in some of the higher grade ones if you wish.
EDIT: I would be extremely wary of that site, for nothing else than they use the wrong name for the shrimp. Anyone who has spent any amount of time in the shrimp hobby knows that shrimpkeepers are extremely careful to call them Crystal Red (not Red Crystal) Shrimp, in order to distinguish the acronym that is formed (CRS) from being confused with what would be formed when you write it the wrong way (RCS, which is the official acronym for Red Cherry Shrimp). It might sound like a small, insignificant thing but it's really not, it's indicative of someone who really has no experience in shrimpbreeding.
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