Please forgive me if this has been covered in the past 600 or so pages. I attempted to search but came up with not quite the answer I am looking for.
I have a question about how the "Greg Purchases" actually work in this game. I have read several threads that mentioned that after a certain amount of time (some say a couple hours, some say a couple days...), Greg will come buy and automatically buy stuff that doesn't sell. That's a good thing, especially if you, like a noob

, price your stuff too high for the market. However, that leads me to my real issue:
Aside from finding out just how often/under what circumstances Greg buys stuff, I would also like to find out whether this auto-buy feature is a flat out cheating method. What I mean is, if I say, for example, set a price for 10 wheat at something ridiculous, like $1000, knowing full well that the item won't ever have the slightest chance of selling in the market, wouldn't I be awarded a bit unfairly, when Greg comes by and drops 1000 clams in my lap for my pitiful pile of wheat?