- They have very strong effects
- They have ONLY 1% success rate to combine
- Any combining will require WARDS
- on average, for max rank 1 enchantment you need 64 shards and aroudn 160$ / total 320$
- now imagine full armor set and weapon with those enchantments in pvp
The fact that you MAY rarely get one of the wards every 5 days or about 100k+ AD each = 1.6m AD per max enchantment - thats 3.2m AD for weapon/armor not including the shards itself.
And they are active in pvp - giving anyone with cash a noticable advantage.