My inexpensive GAC water filter is rated for 10.000 gallons while more expensive "block" water filters are only rated for 500 gallons, why are they so much more expensive?

First of all your 10K filter is rated for chlorine reduction which if properly designed and used will do the job for that quantity, a more expensive "block" filter rates their "life-span" on specific contaminants reductions such as lead, THM's etc. It's like comparing apples to oranges. Granted that you use your 10K chlorine reduction filter within short time you are fine, otherwise you are taking chances of bacterial and chemical "dumping" contaminations. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.