£45/year means NPV is £150 even assuming zero profit for the first year, a 5% discount rate and only five years of payments. So triple your initial revenue estimate.
Now add 20% support fees, chuck in the inevitable additions around single sign-on, cloud storage and other services then start looking at the new opportunities getting your foot in the door just opened up.
Yeah, someone in sales just picked up a new car from this one, they may not be bathing in champagne but I'm betting a bottle or two was drunk.