Corsair Gross Margin - 23.8% Operating Margin- 4.1%
Logitech Gross Margin - 40.5% Operating Margin - 12.7%
Razor Gross Margin - 24.0% Operating Margin- ~6%
Not too high, these are for the last reported q's. Sony will have some savings
None of these companies have a substantial (or any) presence in premium headphones and monitors. They peddle PSUs, cases, mice, keyboards, controllers, chairs, and ultrabooks. >90% of their revenue is likely from their "budget" high volume lines with much thinner margins (e.g $20 mice, $60 cases/PSUs). Beats would be a better point of comparison, production costs on their $300-$600 models were reportedly between $10-$20.
Additionally, similar to Hollywood accounting, financial reports do not reflect actual product margins. A company could earn a 1000% return on every sprocket they sale and still report 5% cause they dump all the actual profits into "overhead"--compensation packages, luxury campuses/offices, luxury cars leases, perk packages, R&D black holes, etc..