While submitting my Java app to Nokia Store QA, when selecting 'Target platforms', I checked "Suppose to work" for almost all platforms (S60 3rd, S60 5th,...), guessing that there is no reason not to work on those devices.
However, most QA failures were about older platforms (S60 2nd, S40 3rd,...), like 'Max Jar size 128 kb' or so.

Now, I can fix those problems, but the question is: Is it wort it?
What percentage of Nokia Store users uses those old devices to download something sometimes? And how many of them purchase anything?

Or more precisely: what platforms should we target for maximum downloads and purchases?