There's been quite a bit written about limited series on the internet and in magazines. Most of what I've read is against the process to one degree or another, saying that it is a ploy created by the art market, that the rules for what constitutes a "series" are vague, etc. Personally, I wouldn't do it unless I've shot another "Moonrise over Hernandez" or am otherwise in the big league - I'm a beginner and think it looks pretentious for a beginner to suggest that their work is valuable enough to ration out.