Some companies choose to save on subscription fees, and develop their own feature flag tools. Like any do-it-yourself solution, this doesn’t necessarily save money in the long run. Homegrown tools take time to build and implement. Plus, they aren’t always accurate, effective, or safe. They might even create more outages then they prevent. Finally, when weighing the cost of a homegrown tool, don’t forget to factor in maintenance expenses. On average, they cost about 25% of the initial build, year over year.