I hate to repet myself but:
1. Why do you think they had enough of modding ? Because they were stupid enough to let pornografic data in the game, later to be discovered and transformed into the Hot Coffee mod ... It was R*'s fault 100%, the modder just discovered it
2. Not only that LCS and VCS were not major titles, they were only released to boost the PSP sales, and later ported to PS2 for more money.Plus if I'm correct they were developed by R* Leeds and did not make it to the PC, whilst GTA 4 is a major title and developed by R* North, every GTA developed by it was released for PC.
3.Ridiculously stupid point ... Do I have to repet my self in each GTA 4 PC topic ? Are you forgetting that XBOX360 is using 2005 unable-to-upgrade technology and the PlayStation3 2006 technology ... Even a two year-old PC can rip the so called next-gen consoles apart ... I don't think it'll require a NASA type-of computer, if you can run Call Of Duty 4 you'll be able to run GTA IV. Let's say it requires a powerfull PC but in the other topic I said that there are 60 million DirectX10 capable PCs sold, whilst the PS3 and XBOX360 have sold around 32 million units ...
I actually tought it would be harder to prove you wrong.