You buy a doscoin miner from the black market and can take it anywhere around the map. You place it somewhere and over time through restart it will mine doscoin. Some locations are better than others and this can be seen by the doscoin miner lighting up red, yellow, green red being the weakest location and slowest gathering point. Once it gets enough doscoin ( lets say max worth up to 100-200k ) you have to take it to a Wong’s triad location and sell it. Keep in mind other people if they find your doscoin miner they can access it and steal your doscoin!
just a little idea that could be cool.