It would make it easier to sort and review estimates that we have won or lost. It's important for our sales team to be able to go over previous estimates to follow up on. Right now we have no feedback other than accepted or viewed. Maybe a spot for the customer to decline estimate with a mandatory comment box for them to ask for changes. (customers are shy and will not leave comment generally.)
Then once we determine that the estimate is no good and customer may have gone with another company it would be nice to mark it as lost. this way we can see our performance.