VPN services market expected to grow another 22% to hit $29 billion in 2009. Managed security services market grew to nearly $5 billion in 2005. Both markets are increasingly lucrative due to increased worldwide deployment of MPLS. Almost half of managed security service revenue came from large organizations, around a third from medium, and 21% from small. Report tracks annual VPN service revenue by service type, technology, remote access vs. site-to-site, intranet vs. extranet.”]
Source: https://www.darkreading.com/attacks-breaches/vpn-security-services-to-hit-37b