I do agree with The Jumping Lord
You would be wrong to think hammers are harming farmers..
Say you did a single farming session and get 10 jewels lv135, 9 are terrible and 1 is good.
9 goes to NPC = basically no profit.
1 sells for 50G
9 sells for 5G each that's 45G
1 sells for 20G (Because good ones are more abundant so price drops)
That's more profit in total. Plus, you get profit with every item which makes the time you spent farming worthwhile even if all you get are bad stats drops.
Just imagine spending an hour with 10 players including yourself just to get trash drops. And since nobody wants these then you NPC them.
You just spent an hour along with other people farming to get no profit. That doesn't really sound appealing at all.
The demand doesn't change just because you need to farm less. if 10 people need jewels then those 10 won't decrease or increase regardless of the number of people farming. You're just supplying items to these 10 players in a single session rather than 10. You're getting more value of your time.
Obviously you don't wanna spend your life farming for good drops to sell to these 10 players. Yes that will yield far more profit in the long run without hammers but with current drop rate, you're better off like this.
That being said, do I like it with hammers or without?
Depends, if we're speaking about group content then I do like hammers.
If it's a solo effort farming then I much rather no hammers.