15% changes everything
When a newspaper loses 15% of its readers or 15% of its advertisers, it goes out of business. There are still people who want to read it, still people who want to advertise, but it's gone.
When a technology company increases its sales by 15%, profits will double. The sales line doesn't have to increase that much for profits to soar.
It's so tempting to head for green fields with a new thing, a new market, a new business. But in fact, 15% right here and right now might be exactly what you need.