Match and target bullets certainly make a difference at 100 yards, just as they make a difference at longer ranges. The bullet you want to use often depends on your specific application. But, I can tell you that some of this is a function of the rifle you're shooting, and your own capability as a shooter.
My competition rifle is an Accuracy International AX rifle in .260 Remington. When I shot plinking grade ammunition through this rifle (Remington factory ammo) I was only able to get my group size down to 1 inch, with many groups in the 1.25" range. When I switch to the Berger Hybrid bullets I use for long range use, I can now shoot groups smaller than 0.5" at 100 yards. But, even that bullet might not be the ideal candidate if my ultimate goal was to shoot 100 yard groups.
Bottom line? Pay for the bullet that provides the performance you need for the task. You don't typically hunt with match bullets, and you don't typically shoot matches with hunting bullets. And, "plinking grade" bullets are often the go-to choice for playing at the range in non-critical applications.
But, for whatever it's worth, unless I'm hunting I don't run anything except match bullets through my precision rifles, and I rarely pay for match bullets when I'm plinking with an AR-15. Your milage may vary.