I think some are worth it. I have a lot of pricy toys in my collection. Tons of Jopens, Fun Factory, Lelo's, Je Joue's, the Intensity, Eroscillator Top Deluxe with Fingertip attachment. I wouldn't put a price tag on my Eroscillator, it consistently gets me off everytime. If it ever broke I'd immediately get another one.
The thing to think about are capabilities. Most luxury toys are waterproof, rechargeable, have more power. That's worth it to me.