Coding bootcamps have proven their value to the students, operators, and employers. Despite their steep cost, generally about $1,000 per week in tuition, schools can’t find enough instructors and expand quickly enough to meet demand. Those students are drawn by advertised placement rates of 90 percent or higher in software developer jobs with salaries that return their investments almost immediately.

The growth of coding bootcamps, at first glance however, appears to be limited by their labor-intensive model. An industry analysis by Course Report finds that 43 schools have emerged in recent years and that they have projected revenue this year of $59 million from 5,987 customers, a growth rate of 175 percent over the 2,178 graduates last year.

But it would take about 7,000 such schools to cover the gap of 1 million computer science graduates by 2020 projected by Code.org. And for the most part, these in-real-life versions are only in major tech hubs, requiring a relocation and 12 weeks to spare, along with $9,000 to $20,000.

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