Absolutely yes, timeshares do not sell themselves even in these areas.
DVC is the only exception I can think of that truly sells itself and it does so because of the parks, not just the timeshare system itself. But you make it a lot easier if you pick a location that comes close to selling itself. Simply being in HI isn't good enough. You've got to offer a premier location for the resort itself such as Kaanapali beach and set yourself apart or you've got to generate the location like Marriott did with Ko Olina. DVC did neither with VB or HH. For VB they put it in a residential area, didn't advertise it nearly enough, didn't get a way to drag in people who were already visiting the area by offering incentives and didn't find a way to get timeshare owners into the property such as developer deposits. I know these are many of the things that members like about the tours but the fact is that volume and higher pressure sell timeshares.