Probably pretty worthless.
Most of the honor societies seem to be solely for resume padding. You pay some money, get a nice cert and cord, and put it on your resume. I have been a member of several for Chemical Engineering, French, and Education, but none provided me any value beyond having it on the resume. The education one occasionally had an interesting article in their magazine. Even that, I doubt an employer made their decision, or even really had their decision swayed in any meaningful fashion, by it.