The Korean games remain fun to play. 9/10ths of things on sale are one-offs like a longer duration healing spell or a temporary strength booster. They generally didn't alter the gameplay hugely. Sure it meant a same-level player could pawn you, but it didn't guarantee it and in most cases the player using these specials wasn't a match for an actual hardcore gamer.
Then there was the marginal 1/10th of products that were like a level 15 armor but a level 12 could wear it. It didn't genuinely change much again, because when I played these games I frequently attacked well out of my level range for the huge XP you'd get because I was genuinely good at fighting in them.
I see Nexon cash cards in 7/11, Bestbuy, Zellers and even in pharmacies. I see Zynga getting sued for millions of dollars for ripping off competitors ideas (Mob Wars, etc).