In my campains I have found that the precentage of normal v.s. magical changes as levels go up. A smart player tends to start with lots of common stuff then slowly replace it with master work equipment. Most don't start looking for magical stuff untill around 4th and even as late as 7th or 8 some still has more wealth in non magical equipment and animals then magcial. Of course by this level many have mitral armor or several master work weapons/tool kits, two or more animals with master work barding, ect. After this point the precentage of magical stuff climbs very quickly, Until around 15 almost every worth keeping track of is magical, or a animal with magical equipment.