LibriVox does this with people who volunteer to read everything. It’s an extremely time consuming endeavor for the readers but they ultimately choose to do so unpaid. Why not create a system that covers the cost of the TTS model at cost as to avoid profiting off of what exists in the public domain? That’s the spirit of things being in the public domain.
I like the idea of letting people donate the audio they purchased to the community.
Although I'm scared that I'll have no money.