I wrote a little post to put those numbers in perspective: <a href="http://www.upbeat.it/2015/01/16/putting-marcos-numbers-in-perspective/" rel="nofollow">http://www.upbeat.it/2015/01/16/putting-marcos-numbers-in-pe...</a>
That's not really a lot of money. Going forward, it looks like he might average $20k/month, at best. If he wanted to hire another developer, for example, he really couldn't afford it. Sure, it's nice for now, but it's not a long-term business.