A card costs almost nothing to send, which means the delivery rate is a bigger share of the price than in any other category.
What decides it
The floor. If your cheapest delivery costs more than a common card, nobody bids on common cards — and commons are what fill a room between the cards people came for.
A weight rule with a small first slab is right. A flat rate set for heavier stock will quietly kill your cheap lots. How delivery is charged.
The four options
Courier — the default and almost always right. Your own delivery — unnecessary unless you are already local. Pickup — occasionally, for a valuable slab. Buyer arranges — rarely.
Combining wins
This is the heart of it. Everything won in one show ships together, combining is on by default, and what each later win adds is yours to set — keep it small and the room bids on more cards.
Say it out loud early in the show. It changes behaviour immediately.
When collection is the honest answer
For a high-value graded card where both sides would rather not involve a courier, and for large bulk lots where the weight starts to matter. Agreed before bidding, with a collect-by window. How pickup works.
Questions people ask
Do slabs cost more to send?
A little — they need a box rather than a mailer. Weigh one and set the slab accordingly.
Is free delivery above a value worth it?
In this category, usually yes.
What dispatch window?
Short, because card buyers expect it and the packing takes a minute.
More: setting up delivery, packing cards.