If one can only see the abstract of a paper without paying $30+, then this means to those of us who don't have the money, the introduction, methods, results, and discussion of the that paper must be called into question, as we cannot verify it.
That does not follow. By "call into question" you mean may not be scientifically valid. Just because you don't wish to pay the money to see them doesn't mean they are not scientifically valid.
It's like saying, well, I can't afford the NY Times so can't read the news. That means the event didn't happen.
This problem (and I sometimes share the frustration) has nothing to do with the nature of science, but with the economics of publishing. The
journal is trying to break even with its publishing costs. It does this by 1) subscriptions and/or 2) advertising. Now, if you don't subscribe to the journal, the publisher wants to get reimbursed by charging you per article.
I would not call someone saying 'In my results, I find that X is true, just trust me on how I found it' science, I do not see how 'In my results, I find X is true, pay $30 to see how' is any different.
Very different. Remember, science is based on the
fact that anyone can get the same results under approximately the same circumstances. That's why the Methods are there: so you can repeat the same circumstances. Now, just because you won't take the time to repeat the experiment doesn't mean it
can't be repeated. It just means you
won't. In this case, it means you
won't pay the $30 to see the article and are limited to the abstract.
As I say, I share your frustration, but your gripe is with the publishers, not with science.