The majority of their tools can be installed on site. SAAS for enterprise is a lot harder to sell.
Most of their tools are built with Java so things are self-contained which makes it easier to install. Also their installations will most likely not need root access. Anybody who knows enterprise knows root access is usually clamped down in enterprise.
Their pricing model encourages a bottom up sales approach. Traditional sales channel for enterprise is top down where you go after execs, senior management, etc. and work your way down. IBM, Microsoft, Oracle, etc. can afford the top down approach. For most startups, this would be impossible. By making it very affordable for disgruntled employees/departments to use their product, they are able to create internal advocates for their product if it does make their life easier.
tldr; Don't make SAAS. Try to make your tool installable with non-root/admin access. Make it very affordable for individuals and small teams because they will become internal advocates if your product is good.