first post!

i am planning on buying a bp as soon as i can scrounge up the money

with all that i've read here, i keep seeing people talking about moving up in cage size as the snake grows.

my question is, could i just beat all that out and go ahead and buy a 30 or 40 gallon cage to keep the snake in for his entire life? or is it really necessary that i give him a small tank to grow out of and move up?