The excess baggage fees to bring the DPV comes from the fact that United Airlines has a monopoly on the Island Hopper Route from Hawaii through the Marshall Islands into Micronesia (Truk), and can charge whatever exorbitant fare they want to. . .
I live on the Island Hopper Route...United Airlines has made so many "drug deals" that even Pablo Escabar would be in envy.
If you are a US citizen it cost you about $1500 from Kwaj to Honolulu; if you are from the Marshall Islands it is about $300 plus they will put you in up graded seats for free.