Backpack.tf site rules:

Be respectful of other users at all times. Insults, harassment, ad hominem and so on will result in a warning or a ban.
Do not create suggestions that:
do not have any evidence whatsoever.
are for selling your own item. Use the classifieds for that.
If you want to find out how to make a good suggestion, read the creating a price suggestion article.
Comments should be constructive. The following is considered to be spam:
Links to image macros
ASCII art
Comments such as "free rep" or "owns one, downvote"
In short, leave that at YouTube.
Do not demand your friends to vote on a suggestion. This counts as price manipulation.
Do not use alternate accounts to vote multiple times on the same suggestion. This also counts as price manipulation.
Do not cut in line. If you list items at a low price then demand users who trade with you to pay more, you will be banned. Use common sense. As soon as people find out you are doing this, they will just report you. It's not worth it.

Official Team Fortress Items Price[backpack.tf]