@Snowbird we are currently working on a new and improved Saved Search email and will provide a detailed update on this very soon.
Members who set a Saved Search are having an increase in success on the platform. The hypothesis around this is that they have a particular ‘need’ a type of Pet, date or location and are being notified timely on these listings. The sitter is then making a detailed and precise application for those listings.
However in the short term if you use the web to set up a US saved search then you will only get one message/email a day. Also as you said you can add relevant states individually OR you can use the map area to search and save a search to get a broad number of states in one saved search. 
