It's really curious why they are that expensive at 4Sevens'. I bought the H60w from them a few days ago and I was aware about the difference in price to Zebralight direct. I preffered it this way, as I had another thing I wanted from 4Sevens and their parcels come over teh normal postal way.
I also ordered Zebralights directly, there's no real problem, their upgraded shipping (free for 79$ or more) is quite fast, but at least where I live the parcels are delivered by a firm like TNT and as neither me nor my wife are at home when they ring the bell, we have to drive quite far to pick it up, the postal office is around the corner and we can get it right after work without a problem. As there's a CPF discount a 4Sevens, the difference gets smaller.
The lights are not cheap, that's true, but other quality lights are in this price region as well. As you probably know, the price is not the size of the light, sometimes smaller is more expensive. The lights have a high quality built, they are extremely lightweight and sport a great UI. I preffer them way over a Quark with a prism or other headlamps, which are bulgy and heavier.
The price is a result of offer and demand, if they were overpriced, not enough people would buy them. I got to them overCPF and reports from other geopcachers, who were fascinated by them. Even my wife loved hers (501w) from the first time she used it, she's afraid to walk through the woods by night as she often twisted her ankle already, the floody beam of the Zebralight makes it safer for her, as she sees where she puts her feet on now and easier ways may also be in teh range of the beam.