It is not that some of the sites couldn't possibly make money (SOME how), but I'm not sure anyone would take your blog or recommendations seriously.
Regarding the space tourism, the info you give is so general ("The current prices are something like 20 million dollars per trip") it sounds as though you have done little if no research into the industry. Considering the amount of money involved, some substantial facts & sources would be necessary.
Also, some of the advice you give, "Just list them one after another, add some photos, a brief description, link to some other source and maybe rating possibility" is simply wrong. So if someone were to follow your suggestions for this site I don't believe it would stand a chance of being profitable.
Regarding the "young male geeks" statement, I was just poking fun... get it!