Hey STM, it's been quite a bit!
I was wondering what is a smart monthly budget to plan in order to be able to do a significant amount of testing with push traffic.
I know the more $$$ the better because more data means more accurate decisions/predictions, but what is enough investment for getting enough data to be able to find profitable campaigns? Consider tier 3 geos obviously, maybe italy too since I know the language..
I remember once vortex talking about how planning a recurring budget to invest in testing campaigns is a better overall feeling than having the pressure of a certain amount being "risked". So I want to try to adopt that mindset.
I see a lot of great information in this section, hopefully this thread can also help other people new to the traffic source when planning a budget to succeed.
Thanks guys for your wisdom! 
Planning a monthly budget really depends on a lot of factors, your geos, your offers and campaigns, your personal finances and your experience level. some people start with just a couple hundred dollars. As for your testing budget, there isn't a clear answer without knowing the vertical and the offer. A good measure to use to start testing is setting the daily budget to 3x-5x the payouts. It is also smart to ask these questions to your account managers. Come check out Pushground where you can find great traffic to test your campaigns on along with some of the best account managers to help you perfect your testing budget.
the fact of setting the daily budget to 3x-5x the payouts definitely can help with finding a good approximation.. thanks for the tip!