Only if you can ensure no one ever replaces what you wrote with their own solution. You become critical in the short term, but also critical to the business to

Only if you can ensure no one ever replaces what you wrote with their own solution. You become critical in the short term, but also critical to the business to replace in the long term, in the same way that a vendor tripling their price often results in short term profits while customers transition off of them, leading to a long term decline in revenue.