Yeah, I never thought of buying items until I considered buying Gold Orbs after beating Dante Must Die with no items (I don't freaking use items). Then they just give me three for free all the time in HoH and HaH. So I had to buy a ton of stuff I never plan on using just to get that 'spend 50k red orbs' trophy. Pfffft.
I have way too many red orbs, and I just keep exploding those gooey red sacks of goodness, anyway.
Back on topic, that's definitely one of my favorite combo videos so far, just because it shows a lot of the unique aspects of DmC's gameplay that other people tend to ignore.