Ok...
So you spend all your time on getting the right gear and flasks etc. and spend hours on end in a raid - every week. Working your way slowly to putting in enough time and effort to finally get that prize possession.
Then along comes skippy who hasn't put in ANY effort or help into getting as far as the team did in the raid, then after weeks of killing the hectic boss with a 5% drop rate on an awesome item ... finally it drops ... the item you've worked so hard for , only to lose it to skippy on an "unlucky" roll.
DKP rewards those who put the time in. Yes, this means those who raid most will get the best gear - but WoW isn't a charity. You reap what you sew.
Erm, 1-5 chance = 20%
1-1000 chance = 0.1%
I hear what you're saying, but I've had characteristically bad luck when it came to rolls.
Why should a new guy get to roll on the TOP items anyway? It's not like the top raiders will roll on every item, just the good stuff they've been waiting for.
When we still did normal rolls in guild raids, we had a rule...
All the new guys could roll on anything - 1 item per boss if it's a contested drop. However, if a Tier token would drop, then the "veterans" who can't upgrade anything BUT those tokens, get preference. Since they help MOST with the fights but won't benefit from most of the loot.