Also one of the potential questions - will it last 13x as long.
1st, Martin is not top of the line, they're really good but they're not top of the line. If you're going to be using Martin as a 'top of the line' example, then you missed a whole swath in the middle that is also pretty decent, such as ADJ and Chauvet (among others).
When someone buys a Martin fixture, they're not just paying for the name. They're paying for the engineering, the materials, the time, etc, etc. They could also pay the Martin staff more than other vendors pay their staff as well.
And while you may buy 4 chinese fixtures for the price of 2 blizzards - if one is defective or doesn't last long, then sure you have 3 left - but what if you NEED 4. Then you're stuck with finding a replacement .. and perhaps quickly. If that day comes, that one purchase will cost you more than you would have paid if you bought the better ones in the first place.
Add to it that the chinese lights may be a one and done. In a year or 2, if you want more, how do you get more? Now you have a possibility of mismatched fixtures.
For me, it's not any one of these things, it's all of them together that would keep me from buying them.