Doesn't he run Roddenberry Enterprises, making $$ off of his father's legacy?
personally, if i had a legacy, that's what i would want my kids to do. this could equally be seen as carrying on the family business.
Carrying on the family business is exactly what it is, in fact. Lincoln Enterprises
(originally Star Trek Enterprises) was founded by Gene and Majel in 1967 and is now headed by Rod Roddenberry, operating via the Roddenberry.com website.
No, that doesn't lend his opinion of the movie that much more weight than the average person's, but in the past he's generally come out as a supporter of Star Trek projects because he actually likes them, rather than simply because it's more profitable for him. He's a fan with a somewhat unique perspective.