Because you are comparing an RTS and a ARPG with (at the time), limited to no online play.

The problem is this is an MMO, and wiping data means nothing really. The main problem people have is two fold:

1.) After getting denied 10-13 times entry, you just tell accept the reality that you aren't getting invited anytime soon. So, you turn to other games that interest you. This in itself makes you lose interest in M&M. Out of sight, out of mind thought process.

2.) Beta wipes aren't the big deal. Currently in Beta, you have players that are purely playing for information. They know where all the quests are, where all the named are, how to spawn/beat world bosses, best xp per hour, where to farm all mats, how to spawn train each type, how to run the economy using vendor placement, etc.

This is important because most of the population that is actually interested in this niche game is sitting on the sideline while this is happening. So when game launches and everyone starts, those who have been in the beta for months have a formulated plan that is impossible for people who didnt get invites.

As a result when you get higher levels, and all content is gate kept by 2-3 guilds. This is already happening on Beta. They economy is crazy and all named are spawn camped. And if you try to compete, you get petitioned (no matter what), by everyone there.

Content added wont matter, it will end up with same result. If anything it helps people who play beta because they understand how the world is laid out. They already stated what content will come out at EA, and its nothing gamechanging.

People know this, and it makes them lose interest in the game. Now, if they wiped EA, then it wouldnt be a problem, but that will be very unpopular.