They're too unreliable. Even when you set the rate to "high", events only happen once every one to three years with me..... don't count on those event bastard for interstellar travel.
Alternatively, I have read that there is speculation that SEV will allow for temporary WPs, so that you could open a WP and use it that turn, but it would be gone the next. If that is true, you can create a mod/start a game with WP openers that open ONLY temporary WPs, and no onboard repair bays for ships. This would make for a very interesting game.....
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O'Neill: I have something I want to confess you. The name's not Kirk. It's Skywalker. Luke Skywalker. -Stargate SG1
EDIT: They're not supposed to be reliable; they're anomolies.
As I said, they used to be more frequent. No, I don't do it that way normally, it's just kinda' fun to put a little twist with some self-imposed restrictions.
After you've played this series for over 8 years, it's nice to have a little variety.