Vampiric Plagueborn Axe of Shelter
Slashing Dmg 6-28 (Requires 8 Axe Mastery)
Damage +14% (while health is above 50%)
Life Stealing: 3
Health Regeneration -1
Armor +7 (vs. physical attacks)
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I'm new to GW market so I'd appreciate if somebody could answer my noob questions

I'm wondering how many times 14^50 is less worth than 15^50
Also if i had pure Gold Plagueborn Axe 14^50 would it be worth more or less? Because I can always add/modify the upgrades right?
Is it worth buying and adding some perfect upgrades to weapons with non perfect or without them?