I'm torn on whether or not to play the Diablo 4 open beta.

Current Events

I know I'm going to buy and play the game at launch, so it's like, why not go ahead and pre-order for a bonus? But then, do I really want to play a game like this for three days and then have all my progress deleted? Seems like it might put a wet blanket on when it actually releases and it won't be as good then or something.
http://i.imgur.com/DCjoiZ0.jpg
https://www.deviantart.com/fuee/art/spanky1-811230163