Hi, My two cents worth " isnt pine and cedar very close to being the same?" That's like saying aren't hickory and ash close to being the same thing. Totally different trees with different wood.
" and if that is true, why are there not alot more pine made arrows if its alot easier to come by?" I'm not sure why pine isn't more widely used. Commercially made pine shafting is available. It's made from lodgepole pine, but for some reason the shafts are sold as "Chondo". Talk about lack of respect! The pine shafts I've purchased or made seem to be a little heavier, a little harder to straighten and just as easily broken as POC.
Part of the reason that pine isn't used more widely may be that the current timber harvesting is not geared toward providing arrow wood. There are many different species of pine, and wood characteristics, especially strength and straightness, vary widely between species. Construction timbers are unlikely to be marked with species name or selected for arrow shaft quality.
For me the best thing about POC is repeatability. If I'm making a batch of arrows for competition I want them to be as perfectly matched as I can make them. POC does that for me. If I were making arrows for roving / stump shooting I'd want ease of making and durability, like ash or birch. For hunting large game, I'd want shafts that were a little heavier and tough, or at least easily repaired, can't beat cane or bamboo.
I've made arrows out of western red cedar ( old fence posts from the pasture) it is easy to work and makes shafts that are similar to POC in strength and weight.
Ron