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I have used ebay for many years to improve my collection and have found some excellent bargains.
That is one of the better reasons to use eBay as you yourself found.
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As an occasional seller, I have found in recent times that there just doesn't seem to be traffic finding my listings.
Are you listing your material for sale at "excellent bargain" prices? Low prices drive views, it may take even lower prices to drive views to items having less collector demand.
EDIT: I wrote the above before I looked at your listings because what I said generally applies to any listing of most any item category.
That said I went and looked at your 19 current listings, most being 1960 BRM. Now I happen to collect postage due covers of some types and periods, BUT I have no interest in any of your postage due listings nor the grouped cover material. I do not collect such Australian items, at any price. Additionally you are not a new seller having seven pages (25 per page) of feedback for your sales.
For you to get a page view of this type of material, postage due origination in Australia, It would need to be mailed in Australia in July 1958, short paid and arrive in the USA assessed postage due also during the month of July 1958, or days after.