If you have done your research and are confident that you can provide the care needed then go for it.
A lot of people do get burms then down the line want rid due to their size. I get really frustrated with the number of burms you see on, on line classified sites. Its not just burms you see iguanas is another that people buy when small.
I have wanted a burm for a while now and keep getting really tempted by an albino burm in one of my local reptile shops. But I won't be getting one until I live in a house where I can accommodate it as it approaches adult size.