dude...Such a stupid guide.
If you could buy Adamant Arrowtips, at 160, and headless arrows at 26. From level 80 you would need to make 1099499 arrows, 300,000 more than broad. 10 xp as opposed to 15~(1/3'd less but keep reading)~
1099499x26 = 28586974 (Total cost of Headless Arrows)...