ANSWER : Mostly because the client said so. What most people, on the non-design side, do not realize is that a logo is not based on a designer’s whim – it is mostly based on the brief filled-in by the client – the more specific the better. Specific briefs help introduce constraints, which are beneficial for the project unlike what is usually assumed – that the designer should be ‘let loose’. Of course, I’m not saying that a lot of blue is a good idea – but a lot of clients tend to get tied down by color-definitions that they might have heard somewhere or read on the internet. Blue is a ‘safe’ option and most tend to take it.