@rikitikitik, I do not know any figures on the tie-in ratios for GC or PS2, but on your comment about it's easier to increase the tie-in ratios for consoles with lower total sales: I do not think it is totally easier because of the fact that if you do have more hardware sales, then there are more potential customers for software (and since they already bought the hardware, another game - even from the bargain bin - is something that is easy to justify).
@apujanata, You raise an intersting point, but how that affects software sales is not something that is totally clear as of now. Also, there are still hardcore gamers that own a Wii (myself being one), but the number is smaller than the 360 crowd, obviously. The hardcore gamers that do own Wiis (many of the first adopters were of this 'type') do contribute significantly to the tie-in ratios and software sales on the Wii. The success of RE4, SMG, GH3, LoZ, and RE: UC all show that there are a dedicated hardcore base on the Wii even though it may be smaller than home consoles have had in the past - though the hardcore group can boost software sales and tie-in ratios.
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I do not know any figures on the tie-in ratios for GC or PS2, but on your comment about it's easier to increase the tie-in ratios for consoles with lower total sales: I do not think it is totally easier because of the fact that if you do have more hardware sales, then there are more potential customers for software (and since they already bought the hardware, another game - even from the bargain bin - is something that is easy to justify).
@apujanata,
You raise an intersting point, but how that affects software sales is not something that is totally clear as of now. Also, there are still hardcore gamers that own a Wii (myself being one), but the number is smaller than the 360 crowd, obviously. The hardcore gamers that do own Wiis (many of the first adopters were of this 'type') do contribute significantly to the tie-in ratios and software sales on the Wii. The success of RE4, SMG, GH3, LoZ, and RE: UC all show that there are a dedicated hardcore base on the Wii even though it may be smaller than home consoles have had in the past - though the hardcore group can boost software sales and tie-in ratios.