If it's not a success or sell, it's either an item that's not in high demand or, which could mean you've picked an inferior RuneScape Gold item either the cost you've set is too high. I don't suggest taking the price down until a day or two after you have put the offer up. Remember, merchandising doesn't happen at the speed of light; it requires lots of patience.
I'd advise buying everything online g.e. If you're working with raw materials such as raw logs, fish herb, etc. Then I'd recommend selling them in the streets for where can i buy runescape gold an established price per item. If you're selling anything else (basically not-skilling items) I'd advise you to sell it via the g.e. It might take a while but it's the most effective way to go since it's much harder to find someone searching for 10 dragon platelegs, rather than 2-k Nature Runes.