Very interesting. Continuing with some perspective using Slack's numbers:

If Slack pulled in $200mil in the last Q and has 122k paying customers, that equates to ~$546 per paying customer per month:

($200,000,000 Q revs / 120,000 paying users / 3 months per Q= $546.45 per paying customer per month for Slack based on Q1 numbers )

Rory has stated multiple times that absolute Nirvana for Verb would be $10

Another way of looking at this, since we have no idea how many paying customers Verb actually has, is to look at revenue per customer in relation to total number of customers and not just paying customers. I have seen that Slack has anywhere from 10-12mil total daily users. I will use the average. So for Slack:

($200,000,000 Q revs / 11,000,000 daily users / 3 months per Q = $6 per total users per month for Slack based on Q1 numbers )

So doing the same math for Verb, in the latest Q, Verb said they generated $2,354,000 of revenue and has 1.4mil users. So for Verb:

($2,354,000 Q revs / 1,200,000 users / 3 months per Q = $0.65 per total users per month for Verb based on Q1 numbers )