The price won't raise at all. Price manipulating is dead since the introduction of free trade. Since the supply is only increasing, as there is no way for items to leave the game, the price will just continue dropping. So no, a whip wouldn't be a good investment.
The thing you should be investing in, are rares. These items are the only ones continuing to go up in price. Rest of the items are most likely a waste of money.
Yea im gonna invest in rares..... if i had 100+M. Who the fuck has the time to make that much money in rs except botters,



