I thought I found the perfect modifier for my dream team of a Triple Valentine Boss Node, one of those gold Invincible Armadas. In the middle of upgrading it, I hit a wrong button and ended up selling it. No "are you sure?" button that I can remember. That sucker cost me 400 (400!) Rift Coins, and in return I got 11k coins :/ I could've just missed the button because apparently I was moving quickly, but I really only remember tapping the screen once. If this is true, please add a confirmation box so this doesn't happen to anyone else!