In "formal" 1v1 you usually assume there isn't any knock back sticks involved. CeruBloo to be fair most of the people that just join op pvp most likely have a knock back stick. Considering they do come in rank kits and when you vote you receive them as well so...
Sooo you pvp someone who doesn't use their KB stick ._. I've been on OP and nobody really uses them often (unless it's the black roofed house) And have the risk of them following you and knowing where you run.
It's like saying remove e-pearls from kitpvp because they run away to spawn. Knockback sticks are very usefull for the new players or simply if the player is not good at pvp. If they run and it's annoying for you, just let them go. Why to bother in following someone for 15mins for just $1 or $2? There's always some other guy who likes to pvp and will not do this.
They are useful but annoying sometimes. On OP Factions and other gamemodes you don't have these knock back sticks because they aren't really needed. Besides, if you are new to the server or just bad at pvp in general this can be easily solved by taking the death, then getting your brand new kit op in 10 minutes.