to be so rich? it's investor money they were bidding with,
It's a mix of investor-provided cash from bond and stock offerings and liquid assets, I would imagine.
as such you'd like to read reasoning for that in quarterly reports, not bullshit about how they saved few tens of millions by their "fx hedging program" (no shit, they really think that's worthwhile info to spend couple of slides on and then just skip over the billion dollar stuff).
That's fairly substantial. Just because you don't want to hear about it, doesn't mean it's not important.
but did they even want to win the bids? did they have solid reasoning for the bids worth? did they even check what they were bidding on?
That's all been covered previously on Slashdot. This was a key strategic buy that was aimed at growing their patent warchest in order to survive patent challenges against technologies like Android (e.g. the Oracle/Java suit).
have you noticed how android is not actually letting fresh new players enter the phone market? niche production numbers aside, only the same old moto, samsung, lg, huawei, sony-e etc are in the game and they got their patents and licensing for the patents covered.
Uh... smartphones were the sole domain of 2 primary players and one "yeah, right," contender until Android came along. HTC and LG specifically had very little hope of producing a viable smartphone without Android. The problem is that the licensing for all of the non-OS technologies is crazy, so only the largest companies have any hope of surviving in the market, right now. This is not something Google has any control over.