are Fanboys a good thing?

Did you see the Star Trek photos I posted a few days ago? There are one or two more out there, along with loads of conjecture about the plot, the characters and the respect the director, J.J. Abrams has for the source material.
Trekkies, as they used to be called have somewhat evolved into what society now calls fanboys. The only difference in the two terms is the source material. You see, a fanboy can be that person who dresses up as the characters, learns the ins and outs of everything in a movie, and seems to have difficulty determining the movie world from the real world (think Justin Long's character in Galaxy Quest) and a Trekkie is the same thing, only exclusively Star Trek. Since the franchise has been dormant for some time, they have dropped the exclusiveness and branched out to other movies.
So, here is where the discussion comes in. These fanboys, flocking back to the resurrection of Star Trek have dissected every photo very carefully and have found many reasons to hate it, including the color of the uniforms, the look of the set in the background and the look of the character, specifically their age.
So, is this extreme....'passion' a good thing for a movie, or does it turn everyone else off from a movie, for fear that it's only made for these fanboys?
I have done my fair share of drooling over trailers, posters and shots of movies, but what you have to realise is that is one snapshot of one scene in a massive collage of shots. The director and producer have to take those shots and turn it into a movie, so, how can you determine anything based on one shot? I think the only thing these photos are good for is getting the word out there is a movie coming, and stirring up movie blogs like this one in anticipation of the movie, not giving a glimpse into characters, plots and further details.
I personally think these fanboys give people who are passionate about movies a bad name, and, due to their technical prowess and passion, they often can be responsible for a movie getting a bad name well before the movie comes out. The reverse, however, is they are often the bulk of the money spent on the movie the opening weekend.
So, while movies must recognize the fanboys, I don't think they are worth constructing an entire movie around. However, it may be smart to listen to them, because they do have an eye for detail, and may often spot things not noticed by producers, however unlikely.