Considering the user base of the DS being over 100 millions... 900k, in other words, less than 1% is really too little to be deemed a success. I can understand that many DS owners are 60 year olds or casual gamers but still, there must be a good amount who should buy the game. If they don't, it's unfortunate that the game failed to deliver.

PSP also have huge piracy and smaller userbase.

Awesome pick up, how could I forget? The target audience for GTA on DS would have a very high piracy rate! Thanks for reminding me!

I somewhat agree... but I would set the sales bar higher.... 900K is way to low... More like 1.5M

not higher than the PSP thats for sure still sold less.

 Actually, this might have helped LCS as it was used as an app loader early on in the homebrew community.

http://www.psp-programming.com/tutorials/guide/installing-homebrew.htm#2.01

lol :P

Maybe used copies , after the exploit all new retail copies were patched.

 There is no extra attraction because it is 3D, I will grant you that. There is additional attraction because the game plays differently in 2D rather than 3D. There are a few other genres that just feel completely different when in 3D rather thn 2D Look at the Japan sales of NSMB vs the sales of SMG as an example of this in platformers. It is absurd to discount radical changes in gameplay mechanics as a reason for a radical shift in popularity.

OP needs a hobby :P