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From what I've seen, you have 85-90% of people who don't bother anymore to practice their defenses and what not to perfection. The problem is now you've further separated the average joe non-practicer from the bored practicer. What happens is joe practicer comes
along and wipes the floor with non-practicer.
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Just from a numerical standpoint, non-practicers won't get tooled too often by players that practice all their skills to perfection, just because there aren't as many of them around (by your guess approx 10% of the mud, I'd guess even fewer). As a chronically lazy person who only occassionally practices anything to perfection, I'm okay with anything that decreases the percent of the playerbase that feels it is a necessity.

Furthermore, a couple of things come into play. Most of the perfectionists are the type of player that seek a challenge and won't hunt the same character over and over if said character has proven to be of little challenge and always wears crap gear. Also, the non-perfectionists are going to quickly rank out of pk-range of the perfectionists, or at least reach a range where perfected skills make less of a difference. So while a rank 15 fire giant warrior with perfect defense, every weapon mastered, and a good set of gear is extremely deadly, by not spending any time practicing there is a pretty small window during which he is a threat.

Finally, I've read countless logs where a player up and deletes because they got tooled - and in their own words even though they had everything at 100%. I firmly believe characters with 100% skills are rage deleted more often than characters with sub-perfect skills. I don't know if it's a chicken and egg thing though - is it that more rage deleters perfect skills, or perfect skills leads to rage deletion.