If you under insure, seller assumes the risk. There's no way around it.
This is simply not true. I do it all the time, and seeing it is at my buyer's requests, I assume zero responsibility and only accept payments in such a way to insure it stays that way.
You really can't insure a cue shipped into most Countries for 5K and upward, even if your buyer was willing to pay the duties (which they are not ever). You are just begging customs to open the package and call anything they see as "ivory" (and probably be right at that price).
I'm not saying don't do it. I do it quite often. I'm saying there is no way that is safe for everyone. If you are going to do it with me, you as a buyer assume all the risk and pay me in a non-reversible fashion. Don't want to do it that way? I completely understand, I wouldn't buy that way either. Then again, my profit margins are very small, which I understand may not be the case with some foreign cue dealers.
Even though I'm not at risk, I still sweat the delivery like crazy. Luckily, thus far, no problems.
I ship Internationally USPS Express Mail, insured and declared as "used pool cue" for $100.
Thanks
Kevin