From our unusual suggestion rules in the forums:

"Exceptions when buy orders don't necessarily counter lower sales

- Numbers Matter - if there is only 1 lonely buy order and 3 sales lower than that it probably doesn't counter. Also generic buy orders (any effect) are usually buying more than 1 copy of a hat.

- Common Trading Point - if there is a huge number of sales at or around buyer prices then it might be included in the price range. Sellers being close to buy orders is also an indication for that.

- Market Shifts - timing of buy orders and sales matter: If a sale took place before a buy order was created the seller obviously couldn't just "sell it to the buy order instead".

- Counter Buy Orders - Buy orders created after a suggestion was made with the sole purpose of countering the suggestion will be structurally ignored."

In this case, the sole sale was to a buy order and for an unpriced Unusual. In cases like this, it's best to wait for more sales. If you have other examples of accepted suggestions, I'd be happy to talk through them.