Multiple Versions of Singles

[RyRyMini]

For Ayu, and many other artists, releasing multiple versions of the same single is becoming the standard. Although she did it periodically in the past, since Mirrorcle World and not counting Sunrise/Sunset, Ayu has released 3-4 versions of each single.

Why do you guys think this is? Is it to entice buyers into buying all versions based on their menial differences? Is it for profit, or for the ranking on Oricon? Is it a scam?

If you're someone who has bought all versions of a single, why did you do it? Was it for collection purposes or because you were truly interested in the extras each version contained?