In British English—or, as the British say, "English"—"learned" is used in phrases such as "a learned professor", in which case it is pronounced with two syllables.
Either "learnt" or "learned" are used interchangably in phrases like "I learnt a valuable lesson today".
I'd hate to think that the sole litmus test for any scientific endeavor would become "is there any money in it".
What ever you want is going to cost a little more than it is worth. -- The Second Law Of Thermodynamics