The 10k is merely an experiment to OSRS gold determine whether they purchase and you need to wait for 5-10 minutes. If they don't buy, then raise your bid by 2 to 3gp until they buy. You can sell 1-2gp at a price that is lower than middle.
In general, you'll get 10-12gp per oak plank (which implies you need to place your purchase price at 13-17, which is under the middle) You may seem like a lot, but the next time you'll receive even more...before the blink of an eye, you will be trading regularly 25,000 and earning 300k per trade.
It could take about a week to complete however, it's one of those tasks you can do up to the point of completion The planks of oak are affordable and as long as you don't buy at a price that is too close to the mid-price and don't spend too much, you will probably always make money.
Hey, I haven't played Runescape for over six years, and not since I was an addict brainwashed, brainwashed kid. My account was compromised because I was an amateur at working emails, and not being able to distinguish a fake email from one that was genuine, however, the fact that I lost control over my account is what's important. At the time, I was transferring to games like World of Warcraft, and consequently, I was not motivated to work hard on restoring my account. So, I didn't. I let it go to the hacker.
Six years later, referred to as the last week, I decided to revisit Runescape and find out what has changed since the time I first played it back in 2007. Additionally, I chose to retrieve my account; an easy task given that I had a lot of evidence to buy old school rs gold support the initial two year of my account.