The idea behind 'only revenue growth matters' is that if you have an exponential growth curve then the actual numbers don't matter as long as they are positive.

The idea behind 'only revenue growth matters' is that if you have an exponential growth curve then the actual numbers don't matter as long as they are positive. If you're making tiny margins on every $1 of revenue then you'll still be a billion dollar profit business quite quickly if you grow that revenue by 100% every week. $100 sales and $1 profit this week? No problem, wait awhile and soon it's $1 billion profit off of $100 billion revenue. Whether this model is realistic is obviously very much up for debate. Just because you grow 100% for the last 50 weeks says nothing about what will happen on week 51 when the easy source of growth is gone but your burn rate has to increase further to keep afloat... Of course, with scale you might be now making $2 off every $100 and your profit is now growing enough anyway? Either way, using any single number as a proxy (or even complex finance without understanding the operating market) is never going to give you a perfect picture of anything.