Exploiting is a good name

I sold some quality 60/60 daggers for 300 tria, since they are not
much better than Trasoks or Harnquists dagger.
One of them who i sold the dagger say some days to me, that he stacked my 60/60 daggers with daggers from a other crafter what had the highest quality (300/300) and now he have daggers with 200/200 quality.
So what can we do for such people?
The other thing is, we can stack our crafted weapons to standard weapons, sold by Trasok or Harnquist. I told them a game master and the answer was that is maybe a feature.
Now if someone would stuck the exploited 300/300 daggers with Harnquists or Trasoks dagger to get the double amount of weapons with 150/150 or something else, who can control them? Does taken away all daggers, swords or weapons decreases the exploiters?
I made 15 daggers with the high quality, i sold some of them, some other I gave away to friends. Now does i know, who use them to stuck the weapons to other weapons?
The other thing is, some month ago, we was able to make 1000/1000 weapons, and Talad saw, that 300 is max. So making max weapons is cheating? And how long does you find the weapons in the world?
I have no problem if the quality greater than 150 set to 150, but taken out all weapons is the wrong way, some of the crafters buy the raw materials from other people.
Now there is a new bug, where i found a people who used the bug knowingly, i does not knowing the bug, but as i talked to him he stumbled some meaningless answers and going off.