What is the relationship between the first party output on a console/PC platform and other game success rates?

[Mnementh]

IcaroRibeiro said:

I'm confused. Do you want to understand if there is synergy between first party output and third party output, hence if a first party start to release too much games for a specific genre other games from that genre will also blossom due to affinity for the first party library?

I'd say yes, but barely. If anything in multiplayer games like Splatoon having competition with Fornite and Overwatch must not be exactly the best idea. I'm not seeing third party platformers or kart racers selling more on Switch just because Switch owners buy a lot of Mario games 

Actually...

We don't have too much data on Switch titles as VGC stopped tracking, but we do have data for WiiU. Sonic & All-Stars Racing Transformed is a multiplatform Kart racer, and it did sell according to VGC the following:

1. X360: 580K
2. WiiU: 530K
3. PS3: 500K
4. Vita: 440K
5. 3DS: 300K

So WiiU is quite good. Given, that the game came late in the life of PS3 and X360, but still a year to the successors and as games often sell frontloaded, they should've had the majority of their sales.

Another datapoint would be Rayman Legends. This has more platforms. PS4 version with 1.5M is far ahead of WiiU version with 680K and the late port for Switch is counted with 690K just ahead, but everything else falls behind: PS3 (610K), X360 (460K), XOne (380K), PSV (160K).

Compare that to other genres. Deus Ex: Human Revolution sold only 110K on WiiU, less than 10% of the 1.38M on both PS3 and X360. Batman Arkham City sold 370K, again less than 10% of the 4.75M on X360 and 5.54 on PS3. Assassin's Creed III sold 360K against 5.31M on 360 and 6.5M on PS3.

Even Resident Evil Revelations, which originated on a Nintendo platform and where WiiU isn't the only one getting a late port of: WiiU only 220K, X360 with 260K and PS3 with 760K. The original 3DS release sold 890K.

So WiiU while not selling a lot and generally not having great sales in comparison to other platforms for multiplat games, was still competitive withKart racers and platformers. So there is at least a hint, that this theory could have some base in reality.