Do you build racers or cruisers? High tech materials are more expensive. Metal masts are available from marine suppliers in a wide variety of stock sizes. You can't build one as good. If you are a sailor, a big advantage of metal is lightening protection and it becomes apparent once you experience storm conditions.
I build small racing sailboats (3-4 m in length) for myself, as a hobby, sailing and racing inland. But I do have quite a lot of experience with them already. Most are built on a shoestring budget (<1000$). Definitely no high-tech materials. Seaworthiness, storms and lightning are of little concern. I am trying to explore and work out new boatbuilding methods that are both simple and cheap, to share with the rest of the boatbuilding community in my country - other builders with VERY limited financial means.
I am aware that I can't build something as good as the stuff made in factories for class-regulated sailboats. But I want to see how close I can get to that with simple DIY means.