Yup, opticaspace = batteryspace.
I know for a fact they're not making mad proft on those though. To buy those lights from a domestic US source, as they are, you're looking at a cost of about $35-40 wholesale with $38-40 being the numbers typically quoted.
So it's really not a ripoff - those lights, from that vendor are simply going through too many hands.
Dae's prices are incredibly low, almost below wholesale. I know what those lights cost directly from the manufacturer and I'd wholesale them for more than he is retailing them for. Keep in mind though that outside of this, and a few other forums, most people don't know about Dae's sites and even if they did might not order from him because he's an offshore company.