There's little enough for income sources up there. It's their land, so it's up to them what to charge. Look what it costs to enter a Provincial or Federal park. And the folks at Killbear Provincial Park also charge to go ashore and also have tried to charge for anchoring.
I've always thought it would be a good location for a marina. If they could find a way to finance it, they could put in 200 to 400 slips and as long as the fees were reasonable, they'd fill em in no time flat. Would creat quite a few jobs in the construction phase and a fair number of longer term jobs when complete to staff it. Add some service facilities, lift out and winter storage and you could end up with year round jobs. There's a marina up on aboriginal lands on the East side of Georgian Bay at the top of 12 Mile Bay called the Moose Deer Point Marina. Quite a few boats berthed there. We stayed overnight a few years back. I'd consider a slip. It'd be a longer drive than where we are now, but it's protected enough that it'd be a rare day you couldn't sail. And instead of a 5 hour plus crossing from where we are now, I could be off the dock and anchored in a cove in a couple of hours or less.