[mothered]

what if sinisterly had it like you needed to login or register to see the content of the site

There's fors and against, hence may or may not work depending on the Individual.

Also, having content displayed helps Google's bots crawl and Index pages. This Is helpful for sites that don't generate too much activity. Personally, I like to view the content (or at least some) prior to making a decision whether to register.
Others may have different views.