1) You have to provide context for everything. Current real time revenue is presented right next to the 14 day average revenue up to that point in time, and also how many standard deviations the delta between the two is. Ie: Current revenue is $100 at 10am, vs. 14 day average of $90, which is 0.2 standard deviations of revenue at that time.
2) Hourly revenue is presented the same way, right next to the 14 day average revenue for that hour and the SD delta.
3) Look at it a lot. I've been looking at this sheet regularly for over a year now, and I have a really good feel/instinct for what a normal revenue swing is, and an even better feel for the impact of different features/content/events/promotions on our revenue.
4) This approach also works better when the impact of your releases is high. A big release typically spikes revenue 2-3 SD above baseline, and causes an immediate and highly visible effect. So while I'm not strictly testing for statistical significance, it's one of those things where it's pretty obvious.
5) It also works better if you use it in conjunction with other metrics. We validate insights/intuitions gained from looking at realtime data against weekly cohorted metrics for the last several months of cohorts.