Often when someone gets banned who thinks that all of their feedback was legitimate, it was due to a local trade.
We are very specific about local deals. It says right on the page where you leave feedback: "State if you are the buyer, seller or trader. Be sure to list the product name, and your opinion of this user. (Example: Bought Ego / A- / Would do business again!). If this transaction happened locally, it must also be specified in this box!
If you receive feedback from a local deal that doesn't have all the correct information, it is your responsibility to report it and follow up to make sure it is edited or removed.
There's also a link right on the page where you leave feedback to the full feedback rules
which are very clear as well about local deals:
Originally Posted by Feedback Rules
2. All feedback must be from PbNation. The deal must be made through PbNation and not locally at the field, on eBay or down the hall with your brother. You can meet locally to exchange gear or money, but the deal must have originated in public areas on PbNation (PM's are not valid for feedback). If you meet locally to exchange items you need to state this in the feedback. You may NOT say "fast shipping" in such circumstances or anything similar. If the person is known to you (on your team, friend from school or a relative), you must say this also. (See rule # 7 for more.) You may not post any feedback that may be misleading. Violating any of these rules is feedback fraud.
7. Please follow this format when entering feedback. Include what the item was, a short review of the transaction and a detail or two that stands out (example: 2005 Ego / B+ / would do business again, should have been packed better). Since this is the only part other people will be able to see, make sure to leave some detail to help them out. You must indicate if the person was a friend, teammate, relative or local in this blank. You also must put if the transaction was done any way besides shipping the part through UPS, USPS, Fed Ex or DHL. You also must say so if you used a 3rd party. Avoiding any of these three rules is feedback fraud.