If you buy bigger items, you often see a difference in delivery charges to far (WA) or remote locations.  While not wonderfull, often a buyer from a remote area expects a bit extra cost to get larger items.

I don't believe you should take a hit.  If your prices are fair, and your delivery prices reasonable, then people will buy I believe.

Research couriers.   Also to remote areas, think about bus delivery.  Some bus lines offer that service.

Good luck with your new venture  🙂