So the entrepreneurial inventor just starting a business may not be the best contingent fee client, because the business will take the lion's share of his time, and you will be left paying for experts to make up for his unavailability. The client must also be decisive, because the window for critical decisions may be narrow. So, if the client is a group of investors in a patent, make sure one person is authorized to make important decisions about filing suit, settlements, and so forth. An uncommitted client is potentially disastrous for a contingent fee case. Make sure your client is forthcoming.
Some clients hold things back, unwittingly or otherwise.
Inventors sometimes feel they must hold something back to protect their best ideas. If they do, immediate best mode and enablement problems may result. All of these will haunt you if they come out for the first time during a deposition. If you expect to win your case, choose your court well. Courts vary greatly in their speed, and in their willingness to insure that discovery does not become disproportionate to the available resources and issues involved.