Stats by themselves show some traction but the matter here is how much time did it take to get there? What is your main metric? Also you should define better the focus of the investment since 500k for 6-8 months seems very high, usually you should think in cycles of 18 months or at least 1 year.
Thinking that what works for other companies can works for you. You have to think HARD about your company goals and what you want to achieve, taking “inspiration” from others is just a way to delay.