When you start your profitable because you have low overheads do you’ve just solved the problem, unreliable acquisition, as you scale and focus on one reliable acquisition channel, cost of impressions go up, have to market to colder audiences, and cost of things go up, which all chew margins
Invisible hand of word of mouth to help your margins,
The above three are all reasons why Shane and I didn’t go too far with the scale of our business, only after trying to do it though did we realise how quickly our margins were being eaten