Dropping numbers is not dropping facts....
1-legendary enchants are somewhat cheap on broker around 12kk. Incorrect fact you are only stating your server and your faction in my Auction they are around 18M and we had a big kinah nerf what about new players?
in broker u can find enchants and bundles with enchants, sometimes bundle is cheaeper..but true server/faction may have different prices
stormwing/elyos usual price 10-12kk for elgendary pvp/pve stone
2 What quest? How many stones you get? Is it daily/weekly? You are probably talking about those one time quest so basically you get 10 stones in total. Let me remind you one thing full armor plus weapon with no fail which is impossible is between 50 to 70 stones just to get +10.... try again
3 Fame lvl 1 if inggi/gelk gives u 2 stones per week random between ancestral and leg. Have you tried? You mainly get ancestrals
inggi lvl 4 gives you 3 leg pvp/pve so statistically that 1.5 pve stone per week....
So basically you dont get more than 10 or 20 pve stones here the first time then you are lucky if you get 3 per week. You need 30-50 more so that is about 10 weeks nearly 3 months just to get your gear +10 if you fail not stones....
If you are a new player you will never make it to end game content.
That is not even taking into account the fame and exp farming to be able to get those items every week.
Feel free to give us more detail maybe we are missing something
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am too lazy to check quests , but it should be weekly quests (with either manastone or ench as reward). anyway dumaha siege altars give leg enchs for participation on each altar..just be there do some dmg to something there then move to other altar..there is alot of altars 
siege is 2 times a day...dumaha opens every other day
and from your faction altars u can buy 5 leg ench coupouns weekly (eats 18 stellium per coupon and 10 ancients enchs for trader...ancient u can get tons from lakrum traders (genesis))
2 leg ench from gold sand (7 ignots each = 9.1kk ench)
stella 3 leg ench from box per run, 4 people needed to open box, still high chance to get one
there is also stormwing event running atm..u can get stones from there too...but most peple go with daevanion select box
not sure where u get 3 ench when ure *lucky*
maybe u talked about ultimate ench stones? 3 weekly sounds about right