Some people find it easier to base sounds and pronunciation on written examples.
Some, yes. All?
Look at them English speaking members of this forum looking for audio materials. Does it give you a hint?
And besides we already have an audio/video thread for the Polish alphabet.
The alphabet alone isn't even the beginning of the story. What I had in mind was individual requests for pronunciation. These could be even automatically deleted after some predefined time, if storage space is at premium.