Metal Sonic gear bound on acquisition?

This might be a bug, I'm not sure. Because the Metal Sonic gear is only available for a limited time, I wanted to pick it up and then save it for when it will be worth more later and resell it then. There are two ways to get it: Buying a $20 ce pack, or buying Sonic CD on Steam for $5. The latter seemed more sensible, since I don't really need the ce as much with an elevator pass and I do play through Steam.
But when I received the gear in-game, it was already bound to me without me equipping it. I see there are some in the Auction House already, I know you can get them unbound. Is it seriously only the $20 ones that come unbound? I would've gotten those ones if I'd known the $5 set would be bound, I don't particularly like the Sonic gear much. I feel too gypped to go and buy the $20 set now though.
There really needs to be a way to unbind costume armor.

Ah, thank you for clarifying that. They really need to mention that in-game, it makes it sound like a free bonus both ways of purchasing it, and I assumed it'd remain unbound either way.

You can also get it unbound from Boost for 3200ce per piece.

If you bought the Metal Sonic Pack for $20, you can use the CE to get another Metal Sonic for either a Bud or Extra Crowns in the Future.

I played sonic CD on sonic gems and found it rather overrated.

http://3.bp.blogspot.com/-IlrcJPwJvfQ/TgX66Ks5dPI/AAAAAAAAAJw/PokQW4X5Ad...
No one Buys a Sonic Game if they're not a Fan.

@Nicoya-Kitty: Yeah, I just discovered that today, didn't know that. That's kind of weird in my opinion, you can get the Tails-Tails and Metal Sonic stuff buy either purchasing 3000-7000-odd ce, or by spending 3000-7000-odd ce. Hm.
@Ironskullkid: Yeah, I pretty much did just that, that's a great idea. Clearly this is in reference to both of your posts. XD
@Odinthefather: I actually picked up two Tails-Tails, one for me and one for a friend, I think they're the best things ever. Tails ftw, both the character and the appendages.
If you buy Sonic CD off of Steam, you get it for Free as a thank you, BOUND.
If you buy the $20 Pack, you get the Metal Sonic Costume UNBOUND, as well as the Starter Kit Bonus.