i did notice this as well. Its sticker shock for sure. We dont Kona on two separate trips. How does the diving in Maui compare? I think we may only dive a couple days.
So, we got certified in Maui back in 92 when we got married, and you know how it is, the first bunch of dives is AMAZING and incredible... We didn't dive again until '93 when we went back. Did a lot if diving there in 93-99 or so (even still use the scubapro frameless mask I found on Molokin back wall in 96 ish.
Then I started diving more including here in California and around the world, and when we went back in 2012 for our 20th and, well, it was ..,,, OK. Since then we've done the Kona Aggressor twice. Other than the manta dive or pelagic magic it is much the same (and I liked Kona marginally better). Lanai Cathedrals is fun, like a jungle gym, especially (I think) Second Cathedral. Molokini is a cool dive. But,..... >$100 per dive worth? Personally don't think so and we did a few shore dives instead (btw dive flag is state law there). Will be there in 3 weeks and doing a double backwall and Cathedrals, and that's it. Probably throw in a few shore dives. Done Makena Landing and Ulua, and Wailea Beach during cert. Want to do Mala and maybe a couple others.
We debated our post vax trip between Maui and Coz, where we have been going more frequently and as you say can get a week of diving for $1K. We have a family place in Maui that we have not been to in a while, and it's our first covid trip and just seemed easier to be in the states
There is a very active facebook group called Maui Mantas, lots of shore dives planned and good place for advice or hooking up with locals. Have not seen that book but this site has pretty much every site
Scuba Shore Diving Site Listing for: Maui, Hawaiian Islands