The sound system is the messenger. The Sound System and Acoustics plays a bigger role in a church than what most people realize. A faithful church member will hear everything they need to every worship service for a minimum of 50 hours per year. In some churches, they can be listening for over 200 hours a year. The sound system, the messenger for the whole church can be responsible for drawing people into church or turning them off church because they can't understand or hear things clearing.
Nothing is forever.
Check out Numbers, chapters 18. A tenth of the tithe went to the upkeep of the House of God, which at that time was just a Tent. This does not include custodians salaries. This is money set aside for maintaining the building in it original condition. A church sound system will get old.