You've clearly been out of price suggesting waaaay too long :P

http://forums.backpack.tf/index.php?/topic/36705-guide-for-non-unusual-suggestions/#entry541096

"So here's what you'll need for proof:

(1) Either a screenshot of classifieds (preferably) or a link to classifieds.

(2) For seller listings: must provide a link to the item being sold

For buyer listings: must provide a link to the profile of the user buying the item.

Rationale: We've started getting a lot of suggestions that provide only a link to classifieds for proof. When the suggestion gets assessed, half of the sellers are gone and the suggestion gets closed. This helps you, the suggester, because you can show that even though the listing is gone, the seller was never able to sell. Similarly, if the buy listing is gone, you can show that it's because the buyer bought one so the suggestion won't get closed.

This will improve the overall quality of suggestions by basing suggestions on sales more than anything else, which is what we have always intended."

It's a new update to suggestions, tbh I never realised it until last week