Do your own editing and proofreading at the end of the project or pay them for a completed eBook package. (indiepublishinggroup.com)
pdf files, however, they may incur additional fees or require a different eBook package for conversion to text. (goodlifeguide.com)
And the fact that libraries often can't get eBook packages / options that provide the content our patrons want (especially in academic libraries). (meredith.wolfwater.com)