I also concur. While I’m not a selector, I work at a library and Patron suggestions are great! There are some online catalogs that have a suggestion for purchase link—They’ll ask Title, Author, Media type (book, audio, dvd, etc), ISBN number, Publisher, and where you heard about the item. This makes it easy for the selector to find the exact book you have in mind. They may also ask if the item is purchased would you like a hold placed on it for you or if another library in the consortium purchases it would you like a hold placed on the item. While most libraries would love to shelve every book out there things to consider will be shelf room, demand for book and if the library is part of a consortium other criteria may include circ history and requests for book.