That's excellent by any metric. Most larger successful companies have a very hard time consistently breaking the 200K / employee / year turnover level and this is 2.5 times that. On top of that they are indestructible, with that much left on the table a couple of years of solid saving and you can start thinking about much larger projects, and still without outside financing.

10 years is long and if we take the revenues as linearly changing over time and the costs growing roughly linear along with it then years two and three must have been quite difficult, expectations need to be met but the money wasn't really there yet. But now there is.