Agree in essence, as long as some of those delusional wild west punters are kept at bay.
If they collect this small fee and do not insure themselves against the risk then they have not accomplished anything. The fee is not high enough to change the minds of most "over exposed" traders. The fee is not high enough to offset the potential huge losses IB would suffer if the market did decline as their worst-case model assumes. So what is the point?
If they don't want clients to hold these "risky" positions then they should raise the futures margin requirements so it is not possible to build/hold the positions they don't like.