If you can afford it, it's 1000 times better to buy PSAs, so you can optimise your precious time, following up your PSAs.
But what is even more important is that this it's a very duplicable way of building a strong and profitable team that all your PSAs can use.
Anyway you’d better make the experience of running some advertising campaign on your own. So you will be able to appreciate even more the value of your purchased PSAs ; )