I've seen no evidence that adding DRM will make you more money. All games get pirated.
Make it DRM free, and release in as many stores as you can. I know not everyone like Steam, but they are the biggest. GOG is nice, and they don't use DRM.
You aren't looking very hard then. DRM via digital distribution (Steam-like services) has not only completely reversed the steep decline in PC gaming content, it has created a large demand that some have christened the new golden age of PC gaming. Developers like to have absolute control over their content, and services like Steam give them that. Sales over the past few years are statistically significant, which in turn has attracted developers who previously only produced console content to develop for PC.
On top of that, there is the surge of quality indie and mid-level develop content that has been streaming in. Games like Stardrive and Kerbal Space Program would likely have never seen the light of day if they were forced to publish via stores.
Note that I am using the term DRM in the over reaching sense, and not in the "activate your game" sort of way though there is a bit of that also. GOG does lack the intrusive DRM seen in most Steam games, but to keep things in context the vast majority of their content is very old and all of the development costs were paid long before many current gamers were out of diapers. They carry few recent titles.
I dislike DRM like the rest of you, but I can't ignore the fact that it has had a positive affect to the industry as a whole. At some point we all have to come to terms on that fact. The anti-DRM movement has lost.
Ironically, MS and Sony are trying to impliment their own versions of Steam via PSN and XBL in order to reinvent themselves in the same way. Console game piracy is still an issue, and small developers like From Software (Dark Souls) see the long term benefits of services like Steam and have shifted developent accordingly. Multiplatform games help developers, but it really fractures the hardware side in terms of unit sales.
Anyways, the numbers are there.
As to the point, yes all games get pirated to a degree. That said, if you create a platform that makes content cheaper and easier to get while at the same time making it harder for average joe to pirate then you start to get what we have today, which is an increase of game sales and quality content and a decline of prices. It doesn't have to be an either/or situation. I think DRM that requires a persistant internet connection is absymal and should be discarded permentantly, but at the same time when a company chooses a reasonable DRM solution we can't keep waging war.
My .02. Have a good week everyone.