75 Nolan Ryan is a pretty popular card from a very colorful and popular set as well.
That one looks to have pretty nice centering and color.
Many sellers have used the raise the price stradegy with great success on popular cards like this one. Timing with possible more eyes on it a 2nd time around? Who knows, but Ive seen sellers do this with success.
Dumb du-dumb du-dump. 75 cards are plentiful, with no scarce series, a card like this in the near-future is worth around $25 due to the l/r centering. There is nothing exceptional/rare about this card. In fact, if it were up to me this card is a $10-15 card
Loc: Michigan - The Spartan State
It is all about timing for the buy it now/higher listing price cards. Just need some disposable income 40+ year old on any given night to randomly decide to jump back into the hobby, search eBay and decide to pull the trigger on his boyhood hero and the most kick Azz color card of the 70's. No reason to lower the price. Just have to wait a few weeks/months. If he decides that he can't wait he could probably sell it in a day for $50-$55.