Well no, x amount of fluid should clean approximately x amount of records. Does $200 clean 20, 50, 100 or 200 records? And, with it being powdered, how is the shelf life? Most premixed enzyme based cleaners go south after about six months. Does Walker make any claims to how long it will keep in powdered form?
Again, that depends on the user...unless everything is measured out precisely. I could always sit down and clean all my records to find out for sure, but that would be kind of silly. Walker doesn't supply any longevity claims, but my experience is that the "fluid going south" argument is exaggerated. But then again, this isn't pre-mixed...it's unmixed. So I'm not sure it's relevant.
These are not the typical biochemistry enyzymes eg. don't show the same ionic strength, temp and pH considerations. These are newer "industrial" enzymes seem to last for some time according to the info I obtained a while back while talking with the AI folks.
I just heard from Lloyd Walker from Walker Audio and he says that the enzymes should last two to three years as long as the cap on the container is kept tight. He says that the jar he is using is about two years old and it's still fine. That said, the enzymes are the least expensive replacement item in the kit at just $18 a jar, so it's no big deal to buy some more when the time is right.