iTunes Duplicates Cleaner

I am wondering the difference between this and the duplicates finder in MacKeeper so why is it necessary. I am not sure how albulms work when you have duplicate items do you end up with part albums even tho you have each 'song' tho in different playlists or is it intuitive keeping a / each version that still exists in the album. I should clarify I have never bought from Itunes Various courses I've downloaded open up there . Whilst this comment may have its place under Mac Keeper I had looked at this app incase it gave me answers to above and thought the comparison of features of use to others here.

Most of my MP3 files were listed as dublicates! 4900 of 5000! But i can see they all have same name and have same path. So why those should be dublicates?! They are all unique files.

I'll get ragged on again for digression, but here's one main reason this software even exists. Apple sold us 128 kbps songs, then had us pay extra to upgrade them to 256 kbps songs. When you upgrade, it leaves your old version (why?) so you have to use "get info" to delete it. Then when you check for missing downloaded songs, it downloads your 128 kbps songs again. If Apple and iTunes were not so idiotic in how THEY handle this situation, this duplication software would have little market. FURTHER, I have often download the same song multiple times because Apple and iTunes have a primitive comparison algorithm that is my opinion encourages this sort of error. Why does such a smart company, with such huge profit margins, and SO much cash in the bank, still feel the need to rip-off clients who have stayed with them since the SE/30 days?????

You can't charge $15 for a program that just speeds up something you can do natively with iTunes with the show duplicates option. It's a good program, but I personally think it's way overpriced. Should be free or a maximum of $2.