I'm fairly new to this game but have made quite a pretty penny off of the market board, then I remembered certain games have rules about abusing the market too much. Are there any such rules here?
Examples of market board abuse would be:
1) Buying up all stock (one specific item type) below a set value and relisting them all at your new value, save maybe 1 or 2 listings to avoid paying the 5% market charge and maxing profits
2)buying up large stacks splitting and selling at higher then market value, thus taking advantage of smaller buyers and letting the whales buy bigger for less
3)generally anything which counts as total market control strategies such as permanently sitting on 1 or 2 items maintaining their prices nearly indefinitely at your set price

As stated above, are tactics like this "illegal"? Thank you in advanced for any helpful replies (PS. Asked because I couldn't find any other forums stating an answer to this, from Square enix, or third party forums)