Why did you try and get them just to sell them? All people like you are doing is stopping people that really want them getting them.
People need to stop being selfish pricks.
And then you realize people sell doubleshots 8 times the price they paid.
I got one because I wanted to play it, and I played it but wasn't impressed. So i went back to league. Then a few months after I got my kill they sent me two invites for free, and they've just been sitting in my account.
Dota2 kind of overhyped tbh. 
That's quite the opposite for me..
Althought I understand that the game is hard. Last-hitting is more important, denying, rune control, lots of items, faster gameplay, need to be synched as a team, more "active" items, etc.
Thing is, when I go back to LoL, the game feels so slow it's, but I guess it's personnal preference.