There's a difference between a "limited edition" thing from a manufacturer and a "personalized" or customized thing. The latter are true one-offs ... they're not part of a series or edition and thus have no associated additional value except to the person who customized them. A limited edition thing is something special authorized by a manufacturer for a short run to commemorate one thing or another, and thus accrete more value over time, presuming that commemoration is valued.
In the end, to me, they're all cameras to use. If a particular limited edition is appealing to me for whatever reason, I'll buy it, and if a particular camera suits me but I want to change how it looks/feels/works somehow, I'll do that. I'm not a collector except in the most trivial way (like: I have three or four Kodak Retina IIc cameras, each different as being from another build group with tiny incremental differences and a different serial number range ... why? because I just like the Retina IIc a lot and I happened into accreting a few of them as I sought parts to fix my IIIc which had a damaged top plate and bad meter).
G