An official price has been stated by Belisarius, it is $44.99.
Different games, different sizes. I play all my games somewhat regularly. I still put Oblivion and Fallout 3 in from time to time and they've been out a long time. I have a 1-year old in the house so I'm not able to play games for much more than an hour at a time. If I have to spend a quarter of that each time un-installing/re-installing game files ... just not worth it for me.
In response to your comment about piracy ... last I knew no PS3 game has been pirated? I thought the system was still un-crackable. Someone got part of the way there, but not all the way, not far enough to copy games. If anything, the 'game sharing' with sharing accounts would argue against a PSN download in terms of piracy.
I have nothing against people buying this game and enjoying it, just for me the total cost (both in money and other factors) is more than I'm personaly willing to pay for it.
Aksys doesnt release ps3 games only, there is piracy in psp, DS, even xbox, wii, so if they lose there at least i hope i can help them here, so they can keep releasing games for those consoles (specially psp :P) even if they are being destroyed by piracy D:, also, i cant imagine those games taking 35 gigs, not even dragon age gets past 6 gigs in install, but well, is your money, but really, dont let money get in the way of the things you want to do, if you do want agarest =P, im gonna be hella happy when i finally get this game -.-
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