Depends on the volume of the particular cards. Prices always have ebbs and flows and if there's only a few on the market pushing the price down generally you can price above them and they'll still sell pretty quickly. But I have priced quite a few (probably the majority) as the lowest on the market and they haven't sold either.
Looking at the cards there doesn't seem to be a clear downturn across the board but I'm guessing the slight increase in volume due to idlemaster is having a suppressive effect on the whole market especially on more obscure titles. In the past with my pricing generally I'd see around a quarter of my listings sell overnight but the last couple of days it's only been a few. I'm sure once this initial rush finishes off things will return more to normal. I'm not that pressed for funds that I'm going to slash three or four cents off every potential sale unless I have to eventually, that's a few dollars total.
To be clear, I'm not complaining about the existence of idle master, just making observations about the market and my results. But seriously, fuck Blade Symphony. Now I don't even want to try playing the game.