Yesterday XRP was 0.7 $ and now about 0.36 $, and 1 thing you should be aware is XRP devs HOLD most of coins in their hands, When you have most of the coins in the community you can easily Control the market, That how they play dirty game.
They don't need ti manipulate because they are having the complete control so they can easily increase the supply or demand for short term intervals but who cares about centralized shit coins? Any reason to invest on a coin which is already delisted from most of the reputed exchanges.