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Buying or selling large amounts of Dash on exchanges can cause price slippage, resulting in the buyer or seller receiving less value than intended. Large buy orders push the price higher, resulting in overpayment. Sizeable sell orders do the opposite, resulting in less value received for the Dash you sell. Fortunately there are “over the counter” or OTC solutions, where a vendor pairs buyers and sellers, allowing them to conduct large transactions off the exchanges and free from slippage to things like a new website, pr budget, etc. The benefit to you is, you can get many more coins at the current price, than what are available on any exchange. So you can get into a Dash position much easier/cheaper than would otherwise be possible.