I would be willing to pay for quality Maemo applications that meet some of my specific needs, and aren't available with open-source. On my linux system I purchased a program to process and manage the raw files from my camera.

Back in the Zaurus day, I did buy some applications. TexMaker @ $50 was a surprisingly good wordprocessor for the Zaurus/Qtopia. I think a good MS Office compatible application would be worth buying for some.

And when I owned a Palm or PocketPC, I purchased some apps too. But I haven't purchased any Maemo apps, because none seem to be available for sale.

I would also support a bounty system to add features to maemo apps that I use.