I tend to hone my used needles if they are still straight when they become blunt. This comes from being taught by my Granny back in the days when it was frowned upon throwing something away if it could be fixed (a mentality I've apparently carried throughout my life lol). The needle in my daily 15-91 has been in the machine since the start of covid lock-down and been re-honed many a times now but not replaced yet.
I will put a brand new needle in when i buy a old machine that needs servicing.