There are over 200 companies on the secret shopper company list - so how many of them should you apply for? All? Some? Most?

Most mystery shoppers will apply for dozens or more at a time, then repeat the process if many jobs are not being scheduled within a few weeks. Some will go and apply for all companies at once, then narrow it down if too many shops are being requested. However, unless you live in a major metro area, this shouldn't be a problem.