Darth Lars said:
I think that the biggest reason for the changes is to attract collectors. Collectors collect all variations of an item to get a "complete set". He has to make the new changes significant enough to make people want them for the changes.
I don't see it. That only makes sense if he's getting collectors to buy multiple versions. That seems very much what he DOESN'T do. In fact, the opposite of what he does.
I'd go so far as to say this site exists because that's not what he does.