I suppose you could but what r0k said is correct.
The level of free online support available these days through Stack Overflow, iFixit, etc would make doing so a waste of money. The majority of prosumer users can figure out most repairs using iFixit guides.
With that said, it is an essential piece of training if you're wanting to jump into a Mac tech position. ACMT certified techs typically jump to the front of the line when being considered for Mac admin/repair/tech positions.