Earlier quoted context omitted.
I've played to around level 30 or so also and it feels just like any other recent Diablo. So far it seems like I can pay to speed things up/improve the drop rate, or just keep playing without just fine. Is there some spot I'm going to hit that I can't progress without paying?
The article mentions that you can get the best gear for free but it will take you about 10 years. So I'm sure you can play it and have fun. If you try PVP however then you would be at a great advantage if you pay money for upgrades.
Without knowing how money scales in this game it's very hard to judge the 10 years / 110k figure. In D3 sometimes you're grinding exponentially for 1% or even 0.1% improvements at a time, and you don't have to.