[Can someone tell me how to remove collectors from my server]

Hello everytime i host a server everyone races to make collectors and over stock there items which is a problem everyone gets bored to fast.

[Can someone tell me how to remove collectors from my server]

Hello, I have a tekkit server and i would like to remove collectors from my server there cheap and ruin the server some people get advantages over others and its just stupid, My friend was telling me that you can make them not craft able but i can find anything all that comes up is sparkle and Yogscast.