We build video content and localize it in multiple languages, we use voice artists to record the audio for this content, obviously this has scalability issues.

We build video content and localize it in multiple languages, we use voice artists to record the audio for this content, obviously this has scalability issues. We would use TTS if we could find an engine that sounded more like a human and less like a computer, but from our testing of various engines (including the ones posted in the comments) they don't come close to sounding like humans. We are just one business case in a huge sea of opportunity.