I think just like manual trading, which not all trader that works manually will make money from this action, only expert in this field will be rewarded, therefore trading robot, it will depend with system trading inside the logic machine if system trading bad, the robot will waste money, but if good, one advantage robot they more discipline to work based the logic.
One advantage using robot trading is can make a transaction without human intervene, no emotion because robot trading work based on logic machine if new signal has confirmed will then automatically open a new trade, it can run 24 hours using VPS, but trading performance depending with system trading also money management inside the system
Your questions lacks basic information. What is the instrument price at the point of placing trade also effects the trade size. You can go to any margin required calculator and pip calculator to check for yourself.
It's hard to make money with Bot trading from home PC due to latency. If you focus on developing systems to catch really short-term opportunities (like below 1 second duration), then you have to ensure you trade from the place with really low latency like 1-2ms (speed of signal travel to broker servers)