Simple economics surely, make your software 32bit and you have at least increased your userbase. Besides IMHO most of the effort you talk about in making software 32bit was due to the fact that the piece of software was in fact being resurrected, ArtWorks, DataPower2 and PhotoDesk to name a view. Which I'm sure you'll find in your infinite wisdom, is a good thing.
On a other note, I can't see any mention of the 32bit version of PhotoDesk. Was it at the show? Was it running on an Iyonix? Just curious to see how the "Iyonix and crappy years-out-of-date OS" performed in comparison to the... alternatives.