For the average Shaper deck there's very little reason not to run Beth. At worst, she's an Underworld Contacts that doesn't need link, at best she's a cheap, drawback-less Rachel Beckman.
Her numbers are just insane, any Corporation under 5 credits is poor enough to be losing the game and it's extremely easy for them to go over 15 credits just by playing a couple operations or spamming two assets. In fact, you can force them to get so much money by stockpiling credits and locking the remote.
It's only drawbacks are that it's only suplemmentary economy. But damn, it's good!