highsis: Does anyone have constructive insight as to why the price was determined as such, and if this is more profitable in marketing standpoint why other companies won't employ the same strategy, other than "cuz CDprojekt is awesome and EA is evil!" ?
Because EA first and foremost has to satisfy its shareholders, while CD Projekt first and foremost has to satisfy its customers.
EA operates as much (if not more) through stock market revenue/net worth as it operates through actual game sales revenue. For shareholders selling cheaper, being less restrictive, being more open to community demands is riskier than taking the safe route of just publishing Call of Duty 17 at 60$ and DRM-ing the hell out of it. Unnecessary risk gets punished, lower revenue predictions (which they'd initially have to make) without "legitimate" reasons (like new studio acquisitions) get punished, especially with two equally big publishers just waiting to leave them in the dust. That's just how the market works.
Coming out 1 million $ on top in the end by taking a "Witcher 3 risk" isn't worth it because they'll lose more money on the stock market precisely because they took that risk in the first place. And since shareholders usually don't reward risks taken years ago, even if successful, and instead keep punishing every new risk, EA would have to weather out bad year after bad year before their successful risk strategy would actually be rewarded by the stock market. With their business model, they simply can't do that. Stock market losses would kill the company before they'd reach the other side.
GOG/CD Projekt due to its size and structure isn't as bound by shareholder opinion. It almost exclusively operates through sales revenue, and is thus able to take more supposed risks, be more creative, be more open to the community and less restrictive with its licenses. It actually has to be in order to be successful.
tl;dr
EA = managers for shareholders
GOG = gamers for gamers