One interesting use, I thought, of magnetic monopoles (whether they are fundamental particles or not), would be in the construction of a perpetual motion machine. If it is possible to manufacture these monopoles in a controlled manner, it could be possible to create a turbine that accelerates forever (thus generating free energy)... or am I missing something?
Either you are or I am. My guess is that you're assuming that you can manufacture unlimited quantities of these things without expending any energy to do so.
(If the existence of magnetic monopoles enables you to build a perpetual motion machine, why doesn't the (uncontroversial) existence of electric monopoles?)
