I reckon eBay is reading this comment some time ago.
spend $100 or more in one transaction during the offer period, up to a maximum discount of $50 per transaction
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Acceptance. By using or attempting to use the redemption code for this offer, you agree to accept and be bound by these terms and conditions.
Offer Period. This offer commences at 10.00 (AEDT) on 11 January 2019 and is available for a limited time only, for as long as it is advertised by eBay on www.ebay.com.au (“Offer Period”). eBay reserves the right to cancel the offer at any time.
Conditions. The offer entitles you to 5% off the purchase price (excluding postage costs) on all items listed on www.ebay.com.au except the Excluded Items when you spend $100 or more in one transaction during the offer period, up to a maximum discount of $50 per transaction. A maximum of 1 transaction applies. Multiple items may be purchased in one transaction (up to a maximum of 10 items per transaction). All monetary amounts specified in these terms and conditions are in Australian dollars (AUD).
'Excluded Items' means;
all items listed in the following categories;
Cars, Bikes, Boats (9800), Car & Truck Parts (6030), Coins (11116), Collectables (1), Gift Cards (184609), Other Lots More Items (88433), Real Estate (10542), Services (316), Tickets, Travel (11730); and all items sold by the following Sellers: Officeworks