In general, it's best if you're building something that you yourself need.
A single mediocre hire in the first five will often in fact kill a startup.
The company just needs to see you as like this maniacal execution machine.
The tenth social network, and limited only to college students with no money, also terrible. Myspace had won.
Growth and momentum are what a startup lives on and you always have to focus on maintaining these.
So if you want a culture where people work hard, & pay attention to detail, focus on the customer, are frugal: you have to do it yourself.