Most of that depends on two factors, hoby vs profetinal and your skill level.
If your a pro the time to make tools may be beter spent at the forge on paying gigs, as well as the all importaint tax right off (uncle sam whants you to spread the wealth) now at some point skill becomes a factor, forging tongs and other tools (or reforging them) improves your skills for other projects, and as your skills progress you get faster at forging tools (and selling them)
And the last thing is ther is les pride in a bought tool, the tool maker cant tailer it to your style and needs, and I hate re working tools.
Some things you have to make your self, as you cant buy a new chisel worth a dang (to soft, and not profiled right)