It's not that pre-sale tickets aren't transferrable. It's that tickets in specific locations, i.e. general admission, we're not transferrable.
This isn't about TM trying to screw you or running a scam.
Try reading the fine print next time
Try not panicking and buying the first thing that pops up.
Try being patient. These are stadium shows and there are always lots of seats to he had at face value. And I bet at below face value by the day or week of the show.