Re: why no 'Star Trek vs Aliens' comic series?
I don't know what they were at the height of the medium, but I believe now most comics sell in either the 5 or 6 digit range. I can't remember where exactly they are, but I'm pretty sure there are websites that do have the exact numbers for comic sales.
They say a little knowledge is a dangerous thing, but it is not one half so bad as a lot of ignorance. - Terry Pratchett, Equal Rites