If you mean the seller cancels all bids and ends the auction early without a winner eBay gets him/her immediately in the bank account:
It is specifically against the rules for a seller to cancel all bids and end the auction early without a winner IF it is because s/he deliberately set the Starting Price lower than s/he was willing to sell for, and it hasn't reached that high. This is considered fee avoidance because eBay charges a substantial fee for sellers to have a Reserve Price so they aren't promising to sell as low as their Starting Price. But there are legitimate reasons why a seller would have to do so, and a few years ago eBay got tired of having to divine the subjective intent of a seller who took that action, so it adopted some procedures that make it less attractive to do so with that intention: it can only be done before the countdown reaches 12 hours AND it charges a fee (the FVF% for that seller in that category times the highest cancelled bid) when s/he does so (with the first such fee per calendar year waived to allow for the very occasional legitimate reason for doing so).
If you mean the seller cancels the transaction for "out of stock" after the auction ends it is a bit longer before the bank account suffers but if s/he does it enough it will:
The seller automatically gets a "defect" when s/he cancelled the transaction . That is the primary tool eBay uses to weed out bad sellers, downgrading the selling status of those who get too many relative to their sales volume (as opposed to having to pay employees to actually investigate to see how likely it was that the seller had a legitimate reason to cancel vs. deliberate policy violations) which results in higher fees. Also the buyer can leave negative feedback (though it is harder to find a link to do so after a cancelation).
