After 3 years as premium/core member, I don't intend to renew my subscription. The problem is not really the price (US$50.00 or R$156,00) but mainly that I see no real advantage for me in it. It's nice to remove ads and all, but what does DeviantArt really offer in exchange for the money? No more than what you get for free in websites like Flickr or 500px, and for US$165.00 you even get an Adobe Creative Cloud plan on the latter! Here all you get are mostly gimmicks, that's the truth.
I did learn a lot here, but that was completely free of charge, because the people who taught me were just kind enough to do that - nothing to do with my membership status.
I will continue with my account, but I will not become premium unless DeviantArt starts to offer something "real" for my hardly earned money!