I've subscribed to IPO notifications in E-Trade and they usually invite me to participate in some unknown IPOs. They've never sent me any invite to participate

I've subscribed to IPO notifications in E-Trade and they usually invite me to participate in some unknown IPOs. They've never sent me any invite to participate in any high profile IPO, which to me means whatever they send could not find enough interest. Couple of days ago I received E-Trade email telling me I can participate in Square's IPO. Putting this together and the fact that you got the invite as well, I suspect they are having trouble filling up IPO as there is just not enough interest from high profile investors. Clear sign to stay away.