Yes, it will be something that potentially blows the whole thing open but you are lucky if it gets a remote reference in the season wrap-up voice over.
The only actual thing of note that theyve found, after spending hundreds of thousands of dollars, is an old Spanish coin from the 1700s that they found in the first season using a plain old metal detector on the beach.
did they ever continue that find about the alleged Viking stone?
how are they not out of money???
I've wondered about that too, as well as how do they plan on profiting off this investment
Even if there's a vast treasure on the island, it's not like they have salvage rights to it like they would at sea. Any significant treasure would be an archaeological find of historical value that would be regulated by provincial and national authorities. The documentation, processing, and handling of the artifacts would probably be handed over to a government sponsored and approved third party, and ultimately end up in a museum.
I can see them getting a small cut of any potential treasure horde (kind of like a finder's fee), but it would takes years of regulatory red tape and bureaucratic hoops to jump through before that happened, and there's no guarantee that what they eventually received would be valuable enough to put on the auction market and recoup their investment.
My guess is their ultimate plan is an agreement with the government that a portion of what they find will go into a museum that they build on the island (which their company also owns), and that they charge admission to see. That's the only way I see them recouping their investment, and even then it would take years, if not a couple of decades, to break even on cost.