Of course I can't answer for Orange. However, I have lost money in Pinks because of the manupulation. Numerous times, I placed buy orders on pinks. They got part-filled, while I watched other orders getting filled at lower prices?!?! Other sell orders got part filled, while watching other orders getting filled @ more favourable prices. Realizing the relatively low $$$, most of the time, I had no option but to sell the rest at a lower price, because if I don't sell it the same day, I will have to pay another fee, which will either reduce my profit, or possibly increase my loss. When I asked my broker, they said that BB & pinks are filled manually. In other words, they pick & choose which order to fill & which order to @#!&^#.
Another reason I don't like pinks is I hate to biddind "blindly" on a stock.
For a short "personal" answer: Manipulation.