Most store owners don't think about maintenance until something breaks at the worst possible moment. The checkout stops processing on the busiest sales day of the month. An app conflict nobody caught starts showing up in cart abandonment numbers that don't make sense until someone digs into it. A theme update quietly changes something on the product page, and three days pass before anyone notices the store has been losing sales it should have been capturing the whole time. By the time any of that surfaces, the cost is already real.