Private Channel Questions

Hey Everybody, I have a few questions that I can't seems to find clear answers too.

1. Is there a maximum number of Rokus you can associated with a single account?

2. If not, is there any potential problems with having 50-100 Rokus on a single account?

3. When I set up a private channel there is the option: "Internet Connection Required" and then "Yes" or "No" options. What is this option for?
- Does this mean I can have a channel that downloads the content to the Roku for offline playback of the content?
- If I select "No" what does this do?

Thanks in advance for anyone who can provide answers to my questions.

Thanks!