According to today's market estimate, the current price of DASH is: $27.63, the Antminer D7 (1286Gh) can mine 0.40341203 DASH every 24 hours, if the electricity cost is 6 cents/kwH, you can make profit per year.
Of course, if you calculate the net profit, you also need to deduct the cost of purchasing the mining machine.
If you choose to host the miner, you will also need to deduct the hosting fee.