I am all in on this game for sure.
Soon as I can get the funds in I will be paying up. Nothing better than ground floor testing a game you like.
I have done a few Closed, Open, Alpha's, Beta's, etc..
If you come in thinking you will be playing the full game you might as well wait until the Open Beta or Release. Players will not be keeping anything.
Alpha's/Beta's need players that are willing to try everything they can to break the game and find all the bugs & exploits they can and report them so the developers can make the game as polished as they can before release.
And yes if you like testing, helping, and supporting a game like this it is well worth the 50 eu to get in the Alpha.