I agree with Derek, if you are serious about getting into this industry you have to prove yourself. Someone mentioned earlier that if a Lead VA subcontracts work out, the VA receiving the work needs to treat the Lead VA as a client, essentially that is what they are.
On the flip side, if the subcontract VA meets all expectations the Lead VA should provide a testimonial for them. Which will help them get started and the Lead VA has a reliable person.
I know the problem is if they don't perform the Lead VA has egg on their face. Tough position for everyone.