Prices shouldn't go off of one sale. Just saw a card for 105$ because it was the last sold while there were 8 others sold for 180$. Makes it easy to manipulate prices off of fake sales or damaged cards

Can you give me a link to this example you  gave?  I want to look into it more.

We will consider all the sales data we have when calculating the prices.  Newer sales are weighted more than older sales, but the exact weights and final price depend on how old all of the sales are and how many sales there are too.