really good points, OZ.
there are definitely more all-in showdowns, people who hate to fold and will go allin with AQ off suit or pocket 77s preflop in live games. the games can get heated some days after the guy to your right has bought in three times and is desperately trying to double up to break even.
actually, even if the guy to your right hasn't gone through a few buy-ins, he may still go all-in preflop with such marginal holdings. I call it tournament cash game syndrome, or televised poker shenanigans.
if you have watched the WSOP
on ESPN (which most of us have), people do these moves a lot in late stages of tourneys. But this has much to do with how their table has been playing (which is completely transparent to the viewer as they only show these all-in hands and none of the moves that lead up to these decisions), and simply the fact that it is a tournament.
This is very much why knowing what type of player you are up against is huge at these types of ring games. One guys preflop all-in means aces, but with the other guy it could mean tens or worse, or even AT suited. the same goes for post flop action on drawing boards - some will shove and others will play it more conservatively.
are you paying attention?