You need to factor in the cs key to tf key conversation rate. It is around 7 cs keys to 8 tf keys.

Just going to put this out here since I see a lot of people quoting the pure thing incorrectly.

Hats that sell for more pure than their buyout are typically not capped at said buyout BECAUSE they clearly sold for more in pure keys, meaning the buyout seems to have been wrong (i.e someone could've changed his mind right before selling). I think this discussion was held twice, and in one of the cases there was already a separate measure taken; just to show how unusual these situations are and how making one rule for them really doesn't work.

This does NOT apply to cash trades or trades for items close to pure (like cs keys or aussies). If he would have taken 240 cs keys too, then the trade should be valued at no more than 240 TF2 keys. This is comparable to situations where someone pays hats that have buyers at or slightly above the buyout of the seller. They're typically lazy or impatient people that don't care enough to convert their stuff to actual TF2 currency.

The same goes for MP cash sales or SCM sales. In particular, those sales are typically higher due to fees that are not taken into consideration. If you sell for 50 keys in mp funds, you actually only receive enough money to buy 45 keys. I can't recall why exactly, but ranges based on fee-bound sales were removed at some point, and the many situations where MP sales are above current sellers, and where sellers ask for X in keys and list it on mp so that they can buy X keys with the funds they receive actually shows that not accounting for fees results in those sales being valued too high in many cases.

As a summary - the ONLY situations in which buyouts could be ignored in this aspect is if it sells for more TF2 keys than the buyout. This typically never happens. If the buyout here was 240 TF2 keys, then this should be valued at 240 TF2 keys.