I didn't say they're not worth it. They're quality pieces anyway, but you can find similar, same, or even superior quality in other brands for relatively lower prices. In other words, you're usually not getting in return what you paid for, or more rarely you get back exactly what you paid for.
Why do that when you can get more for the less you pay up?
e.g.
Preface: Both are awesome quality pieces, AFAIK, and both are real 7.1 headsets (they physically have the needed loudspeakers per each earpad + bass, no digital reconstruction and/or simulation).
Mad Catz's Tritton 720+ sounds as nice as the Razer's Tiamat 7.1 headset (clearer audio on the former, stronger bass on the latter, equal average quality) and is of the same build quality, but it can cost as low as 120€, while Tiamat costs usually around 180-200€.
That's about 60€ down the drain to have a green lighted triple tentacle on your head, rather than a T-shaped sign...