+1. Getting checks and running to the bank does soak some time for even my low volume business, but I see no reason whatsoever to give 2-3% of what I earn to a third party. That's gas money, mortgage money, honey money....

To me, good sales technique rests on two basic fundamentals:

1) Confidence in your own knowledge, ability and intent
2) Absence of shame about what you need to charge to sell the product and perform the work at a reasonable profit