#1: Appeal your ban on the site https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/0/558747922562007365/

https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/0/864971658468769910/

Here: http://forums.sourceop.com/faq.php?faq=reputation

Or leave it on his Steam profile.

Read #3 to verify you have done everything:
https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/0/558747922562007365/

Just speaking in USD since that is what I am most familiar with.
(All values are estimates)

1 key = 7.88 ref | 71 scrap | $2.30 on market
Trading cards = 10 cents
23 trading cards = $2.30

You just bought a key for 23 scrap (2.55 ref)

Buy trading cards for 1 scrap. Sell on market. Repeat. Buy keys.

Marked as "Todo":
https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/11/558754899128080483/

https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/0/558747922562007365/

I would say to just make a new trade considering the fact it was a newer trade anyways and go from there.

If you have the same problem again, post in the "Bugs and Problems" section and I am sure someone on Staff will further investigate the issue:
https://steamhost.cn/steamcommunity_com/groups/tf2outpost/discussions/11/

Not exactly.

Any tickets from you can be viewed online.
https://support.steampowered.com

Your email is mainly for notifications.
You will get notified through email if:

You have sent a ticket.
Example: http://imgur.com/USCPkCb

You have replied to your ticket.
Example: http://imgur.com/TAieIzv

A staff member has replied to the ticket.
Example: http://imgur.com/dBHReKY