Simply just because you sold it for 1.5 doesn't mean that the price should change. You need a decent proof to convince us.

http://backpack.tf/classifieds/search/5064/6/0

Nope

Help for the new ones:

My friend, welcome to the community! Friendly word of advice, though: You need to have proofs (i.e. Links to various trades) that are in your suggested price range so people will vote on your suggestion. If you don't have these proofs, you simply will not be able to pass a suggestion, and your reputation will plummet. Try starting off with at least 10 proofs of people who have sold/bought in this price range. For now, close the suggestion, find some proofs, wait for your rep to go back up (vote correctly on items), then re-post with the proof links in the comment section. Good luck in the future!

No Proof , Downvote , Sorry. Try again , but with Proof.

Classifieds has plenty unsold for 1.25 keys, you might have gotten lucky.