The thing is, almost any incubator, "ghetto" styrofoam 
		
		
	
	
 , home-made, or whatever, can be made to work well enough with proper monitoring.  I say this with around 15 years of experience of off-and-on incubating. I may not be a "Flock Master" on here, but I was hatching eggs before this site existed 
  Wow, I sound like an old coot 
In addition to my fancy R-Com digital (which requires no monitoring), I have two old LG still airs that I still use (and watch); one had the corner gnawed off by a cat, and I glued it back.  I have Bobwhite quail in it now, as a matter of fact, and they're coming right along.  
Anyway, the worst hatch I've ever gotten in a styrofoam bator was 2 chicks out of 20 eggs: 10%.  But that was with shipped eggs.  With my own, I usually get at least 50%, sometimes up to 90%.  Basically, I'm saying that if you're vigilant, you can hatch chicks.  Barring an extremely poor thermostat or severe accidents, which can happen to anyone, sure, the *person* does the incubating, not the bator.  So, you can spend $40 or $140 or $400 and you can  have chicks...