Don't buy. Beta testers only.
This is the Blast Furnace World Manager. It does NOT make bars, but simply maintains the furnace in the optimal condition. This allows the rest of the bots that ARE making bars to significantly improve smithing rate (More profit!).
I recommend using 1 account for each job for optimal conditions, however 3 can suffice if you follow this pattern:
1 Account for Pumping
1 Account for Pedaling and Pipes (With Pipes having the higher priority)
1 Account for Meter and Coke Filling (With Coke having the higher priority)