What benefit do bullet plugs add to ICs?

Just the opposite Bigkids. Since there is more plastic than metal, the cables have a higher potential to pick up RFI since they are not shielded as well. Plastic is also far more fragile than metal, so you're paying more and getting less for your money. I'm not going to go into specifics as to how silly the idea behind this type of plug is. Sean
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I auditioned a set of cables with Eichmann bullet plugs recently & was very much impressed with the quality of the sound & the excellent connection they made. As for the noise/shielding issue, these particular cables sounded so good I ordered a set, although I opted for XLR ends.

As for them being plastic & cheap, back when I rode Harleys & they came out with a non-metal primary belt, both the old man at the shop I took my bike to & I scoffed at the idea. Now the belt has replaced many final drives as well as timing belts on automobiles. They're not plastic but neither are they metal. Personally, after trying them out, I'd have no problem with them in my system.

Plastic has a totally different resonance signature then metal. It is far easier to tune a metal RCA to the wire harness than plastic one.

Some folks like these plugs especially for DIY projects. The plastic housing does affect the sound (dielectric absorption).
Yet metal plugs have their character so it depends on the user. I still like metal plugs. The Cardas GRMO comes to mind.

You have to be very careful when soldering the wires onto the Bullet Plugs. The plastic melts very easily and if you do a little too much heat or too long, you melt the plastic. They also have a very poor strain relief system. I thought the sound was ok, but a pain in the ass to work with.