To clear up some confusion:
1) Account Sharing is always risky. However, only really risky for the person who gives out their password, not for the one who borrows the item.
2) Should you borrow items and then get banned for supposedly "scamming", you can always make a ticket to prove your case. Keep in mind, screenshots once again are the best proof. But it also depends on other factors. Such as: Has the account that the gear originated from played in the meantime ? And most importantly, what is the story that the person who got scammed put up, where are the differencies ?
In other words, the handling staff member has to try and piece together the entire story. They will check when people logged in and what they did and generally do their best to evaluate the situation. To give a example; If account A allowed account B to borrow something, but then account B went and borrowed every last item, including Zeny of account A, and following that ceased any communication with account A, then it seems much more likely to be a scam over anything else ( especially if they also changed their password after scamming ).
It is always a case of evaluating and figuring out what really is going on. Pretty much detectives work. This is also something that takes a really long time since there are countless logs that need to be checked and evaluated.
3) The person who went and took the gear is mostly banned first, even while the GM is still figuring out what is going on. This is based on both suspicion and simply freezing of the gear. If a scammer knows we are on to them, they likely would react in a way where they would try and drop the items and get rid of them, which makes it much more of a pain in the ass for the GMs to track them down and re-roll the trades.
4) Should the person turn out to be a scammer, they will remain banned, should the person turn out to be innocent, they will be unbanned ( but the gear may or may not be confiscated depending on the circumstances )
In other words, Neetox, you are totally and entirely mistaken and I would like to ask you respectfully to not make up crap about how we handle cases.
Scammers are banned period. Regardless of any recovery was paid. The recovery fee is only to get the items back, nothing else. It does not influence the case in any way at all.
Basically, it's a fee to encourage people to take care with their items. As without such a fee, there would be around 30 to 50 new scam cases every day.