Not sure how how accurate my guesstimate is with this, but that...

Not sure how how accurate my guesstimate is with this, but that means approximately 250,000 end users on the platform. I would be guessing but I would assume an average user revenue of $1.25 -$1.50 per month.

I know the SME plans on the website are a lot higher than this but I would expect the enterprise agreements to significantly bring this number down.
$89/ 25 = $3.56 per user
$269/ 100 = $2.69 per user
$449/ 250 = $ 1.79 per user

Example of Eagers deal. I think someone else said that its $4500/month for 4,000 employees. Average user revenue of $1.25 per user.

Back of envelope calcs for Velpic sass fees.
250,000 users x $1.37 (ave between my guess range of $1.25 & $1.50 per user) = $342,500 per month and $4.1M annualised.