One of the most difficult things for most of the website owners I know who run app review and book blogs is the sheer volume of email requests they get unsolicited. In many cases, simply reading & deleting these emails takes me over an hour a day. If I wanted to properly respond, it could take half the day and then I would never have time to actually DO any of the things people are asking for in all these missives.
Then again, among the most frustrating experiences for an app developer is to submit their app to hundreds of media outlets and to hear absolutely nothing back. And I really empathize with them, having gone through this process myself two years ago, for several apps my husband developed.