It's not only that. Sometimes a small company gets overwhelmed with so many requests and they don't know what to do. Also, other times, the stock of samples are depleted before they get through all the requests. It happens. Sometimes you never know. Sometimes you get an email a week later letting you know you need to pay s/h charges.
Oh well. It happens. At least we still get some wonderful freebies that help to make us feel pampered and save money. Plus, we meet lots of wonderful people in the process.