Hi. And 1 more time... Why you talking about what you TOOOOOTALYYYY not understand?
1. Enchanting have difficult formula - its depend of "LUC" and "spikes". LUC stats we all know - but NCSoft change it without any announcement (so it's kind of Scam - because many people invest in LUC stat alot real money). "Spikes"... it's more difficult to explain - but working like random dmg formula. Can find spikes time? No. Its independent. Spikes working on everything, exanting, crafting, and etc. Why "spikes" - it's just only one way to explain why skills (and etc) enchanting with +93 chance - you can burn it 4-7 times in a row. Normally it's approx impossible - but happen for me me and other ppl many times.
2. Many people say its depends just of you luc... No. This can say just poor in game people - they try 1 time and get +12 or try 10 times and burn it.... Try 1000 times, 10.000 times - and you will see that personal luc simple not exist. It's just mathematic. 99% of server cant make even +6 sets. But exist people who mass making +8 +9 +10 items and sell it (living from RMT).
3. Next time before writing - check AH, and thing little bit.