The main reason that most people limit the height of their cages to 18" to 24" is because it makes the ability to maintain proper temps and humidity levels so much easier. With that 3 extra feet you are creating so much more space that needs to maintain the proper temps and humidity gradient and it becomes much more difficult. I am by no means saying a larger cage can not be maintained properly I am jsut saying that it makes it more difficult.

The second main reason I would think is because most people have multiple snakes and limiting the height of their cages allows them to stack their cages three and four high.

I would really reconsider the use of perches of any kind with in an adult burms enclosure. Just imagine the force that would be put on the body if the dowel that your snake was crawling on broke or if it just happened to fall off. I don't think it would require a fall from a very height to possibly cause injury to your snake once it get's around 100 pounds or so. just something for you to think about. Hope I have helped a little. todd

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