So - knife throwing is a cool early game perk that lets you get great stealth kills

Problem is knives are one shot tiems when done like this

Major problem is - they cost $1000 each

This is a very broken mechanic GOG can you please patch this so knifes are at least re-usuable some of the time??

Yeah, using knife is really cool but i would have the possibility to recover them otherwise also power up knives is useless.