Because LEHPQ is easier to buy, more liquid than LBHGP.
It's tough to buy anything on the greys, no BID or ASK visible.
You could put in an order for some LBHGPs at 10¢, and see if someone sells to you. Keep bumping your price up until you get a fill.
I have an order in for one million LBHGP at .0001, but sadly, no fill yet. LOL
Step aside son, you're blockin' the MOMO! ... .. Disproving absence of evidence should be easy, show the evidence of.