Comment by tialaramex

I've never seen this idea of attach rate as "related to games sold with the console at time of console purchase". I've seen people say attach rate is %of platform which took the game (so e.g. some First Party Nintendo titles score very highly because if you own a Nintendo Wii U, you are very likely to take the Wii-U specific franchise titles) and use tie rate for games per console unit. But never the description you've used.