"[W]hen a statute makes an act illegal, contracts for the performance of the illegal act are deemed void and unenforceable. Contracts based on legitimate subject matter that are performed in an unlawful manner are also unenforceable in certain circumstances."
"[C]ourts have refused to enforce contracts on behalf of employment agencies that have failed to become licensed as required . . . . [Still, some] cases hold that where the violation of a statute is not a serious affront to public policy or . . . seriously injurious to the public welfare, the contract will be enforced."