People are focused on Converters because they're always useful, whereas the other types of merit salvage are of limited utility. One can only catalyze an IO once, or boost an IO a maximum of 5 times, and one has a limited number of IOs per build to catalyze or boost. Whereas with converters, one can endlessly shuffle IOs to get what one wants to keep or sell. That makes them a commodity with a high demand. Of course, commodities prices are more volatile as supply fluctuates. There are times when Converters just don't sell as well as Boosters or Catalysts; conversely, the opposite is true, as well. That's the "trick" behind playing the market: monitoring supply/demand and timing actions accordingly.