I think it might be worth it, although vibrator.com would be better.
You are buying the traffic and the number one spot for vibrators.
It's also a long term investment. 10+ years of traffic for 1 million?
when people search for vibrators, I don't think they use the plural.
look at the alexa of vibrator.com vs vibrators.com
Also, how are you going to differentiate yourself from vibrator.com or
www.sextoys.com or any other site out there.