Initially, this step was significant to those who were serving in the nursery, children's ministry or some other service and missed hearing the message. Back in the day, we recorded on a cassette tape and made copies available. When the cassette recorder wore out, we skipped right over CD's/DVD's and recorded on a digital recorder. This allowed us to save messages on the computer, but often the file was too big to email to people. A copy would then be burned on a CD and given out. Posting the messages from Sunday online makes them available, accessible, and affordable (free).
I admit a concern that successfully posting messages online could give opportunity for people to remain home if the weather is too bad for traveling or too good to give up a morning at church. Reality is that Sunday morning is much more than the message. Studying God's word and seeing how it can guide our everyday lives is a very important part of our Sunday celebration service. But coming together to worship the Lord through singing, giving, children learning about Jesus, and encouraging one another is important and would be missed if we stayed in bed or went out on the boat.
Often people would like to listen to a particular message again while preparing a meal, changing oil in the car or sitting down with a cup of coffee. Check the online messages out, let me know how it is working and any improvements we can do to make it even better.