I'm saying I don't know why GT6 didn't sell so well. I can't believe you are trying to tell me that theres no guarantee that if its on PS4 it won't sell more than if is on PS5 only. Think about that for a few minutes and let it sink in. You just have to see some people on this thread saying they are happy it might be on PS4 and the poll at the top of the page show some people are ok with it being cross gen. Its obvious people will buy it on PS4 if its on PS4. You don't need to be a rocket scientest that it will sell more if its on both PS4 and PS5 because People will buy it on PS4 and PS5. You haven't pointed out anywhere in history that a cross gen GT Game hasn't sold more. You simply pointed out that GT6 which was a PS3 exclusive didn't sell well.
You can repeat all you want. Never have we had a GT game thats been cross gen. You're just pointing out sales of games that have been one gen exclusives.
You aren't pointing out history suggests anything because none of the previous GT games have been cross gen.
You apparently need to be a rocket scientist to understand the point I'm making. Evidence shows it is not a guarentee, not that it can't happen, but that's not a guarentee. For comparison, Forza Motorsport 7, the first Forza Motorpsort title to be released on PC as well as XB, has sold worse than Forza Motorsport 6. Releasing on multiple systems/generations does not guarentee you anything.
You entire argument seems to be that a larger potential consumer base = more sales which is flawed logic and far too overly simplistic. I handle marketing for certain services my team offers at work, I can chuck a few ad's on Google and hey my potential userbase is suddenly enourmous, but I guarentee we'll lose money.
The increased development time and cost can make it not worthwhile, and it can hinder sales. GT6 sold badly because it came out too late for the PS3 even though it only released 1 month after the PS4 came out. Of course, you can argue "ah but if would have sold more if they released a PS4 version". Maybe it would, but then you'd have seen even worse PS3 sales and would those sales have then resulted in a net profit? Or had the PS3 sales kept up, would Sony have seen a drop iin PS4 sale?
The bottom line is, who knows, each game is it's own individual case. But you can't ignore the actual evidence and what has happened in the past not just with the Gran Turismo franchsie. There are absolutely some cross-gen sales successes, but there are also games that have suffered becuse the previous gen title came out too late for that gen console and the current gen title didn't meet the quality of exclusive current gen titles. That's a big call and it takes a lot of time, effort and money to get right.
Yes it does cost more but more sales make up for the extra cost of the extra development. I am aware of how retail and logistics work because I've studied logists and retail and I have certs in both with highest marks you can get in both.
Yet you continue with the fallacy that a larger potential consumer base by it's own guarentees more sales. A smaller better target can yield much better profits, considerably so. A game designed to take full advantage of the PS5's hardware rather than having to keep in mind it needs to be parred down for PS4 as well, targeted at the PS5 user base and people "considering a PS5"
could yield better results which is backed statistically.
Also how are other developers managing to take full advantage of the PS5 NVME drive and yet make their games cross platform?
If they're taking full advantae of the PS5's NVME drive they aren't making it cross gen, simple as. A ross gen title is not taking full advantage of the NVME drive. It may benefit from it, faster loading times etc. But it is not taking full advantage.