If you try to take more than 10 items per day or you try to take more than one of a particular item per day, your offer will be countered or declined.If you see some items you want in the inventory but they don't show up in a trade offer, that's not because you're blocked or anything. Those items are just temporarily or permanently untradable.If your account is sketchy looking, you'll be blocked. Don't use alts to bypass any restrictions. If you take too much stuff without ever giving anything back, you'll be blocked. Just be decent.