I think these character-centric sets are probably aimed more towards people who like the characters and want some of the episodes but don't want to buy or can't afford to buy the boxsets. For that, it is a perfectly good idea.
And at the end of the day, if you've got the sets, you don't have to buy the character collections, so it doesn't affect anyone who doesn't want to buy them. No problem as far as i can see.
And at the end of the day, if you've got the sets, you don't have to buy the character collections, so it doesn't affect anyone who doesn't want to buy them. No problem as far as i can see.