Looking at it realistically - if a site has 1,000 users, the likely hood of all 1,000 users receiving an email every day is slim to none due to the fact that not every user will have a profile view every day.
General statistics or this would be a site with 1,000 users may only have 50-100 active users on any 1 who would say look at between 2 and 5 profiles.
So looking at these stats you would only be sending between 1 & 500 emails daily (maximum 50% of subscriber base)
If you are in a shared environment then you can usually send up to 1,000 emails in any 24 hours depending on your host, and unlimited if you have the correct server environment