Buying that eBook from Amazon is Easy. Downloading that eBook from your public library is Easy. What is Not Easy is being on the other side and managing eBook programs.
Negotiating and managing eBook licenses, testing software, reviewing RFPs, troubleshooting eBook services for users, finding an eBook vendor for the books your patrons or customers want, etc., etc., etc. can be a full-time job.
See NSR, “68 essential resources for eBooks in libraries,” by [law librarian] Ellyssa Kroski, to learn a little about what you need to know to be a good eBook program manager.