In the TipiTents I make, I did not find, at the time, a resin with high enough heat rating and carbon poles made with it of correct dimensions at a cheap enough price to make it either what I felt was safe, or financially feasible, even if it was safe. Aluminum works well unless you can keep the carbon pole a reasonable distance from the stove. With my design, I put the stove about an inch from the pole. This puts the two items that take up floor space right next to each other in an effort to conserve floor space and as such I did not feel comfortable with a carbon pole. Things may have changed since then, but in general, resins capable of high heat without deformation used to make carbon tubes is a niche market and so they are going to be considerably more spendy than the 'run of the mill' carbon tubes--just scale of economy.