This is just idea hunting here, so take these questions with a grain of salt:
Would you like an Android or iOS (iPad, iPod, iPhone) version of the Digital Press Online Rarity Guide?
How much would you pay for that mobile app?
Would you pay more for it if you could access it while offline (out of range of a WiFi or cellular signal)?
Would you like a desktop application that connects directly to the Digital Press O.R.G. to pull prices, rarities, et cetera, without having to go to the DP Web site?
How much would you pay for a desktop app that does that?
Keep in mind, this just a way to see if there is interest, and is no guarantee that any such things will exist in the future. However the more interest (and $$$ willing to be spent) there is, the likelier the odds.