You may want to slow down and read the quote from graham you quoted!
Under your self stated beliefs I doubt your phone would be ringing and I an SURE you would not be able to subcontract him.
@BKS60 and what does you comment has to do with Refrigerant Recovery Tanks? have'nt seen you posted your views on this tread. BTW most of the units I work on has less than 30lb refrigerant per circuit and my way is to use virgin refrigerant to recharge every system.