From what I hear about WSEX, the player base is far too small to be profitable to instantly switch. I've heard (again, from players who have new accounts at WSEX), that there are more profitable games at bigger sites w/ more fish.
WSEX's problem (I assume) is justifying spending the money on promotions and advertising (to build a player base) when they aren't going to be increasing revenue as a result. Essentially, it's what Shabi said: it's an offer to get people on their website, but I doubt we're going to see TV ads and multiple WSOP seat package giveaways.
That's my $.02,
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