Mike,
It could be argued that a difficult, unpredictable bunker will just make the good player think less about whether to challenge it, no? Too hard, and the answer is a resounding "Hell, no!" unless of course, its late in the round when that $5 Nassau is on the line. In general, I think a player would have to feel he has a 2/3 chance of hitting it to the green from the bunker to do anything other than steer clear of it.
Its not about thinking about where not to miss, strategic architecture is about thinking where to challenge and play for advantage.
Of course, depending on where in the round, what type of hole, etc. there sure doesn't need to be any standard depth bunker, although using the 2/3 rule of thumb, that would obviously be deeper for shorter shots. And, nothing wrong with the occaisional "hit it anywhere but here bunker".
Most would argue sand should at least be the same general consistency. We can disagree about how much that ought to be, and most would agree that spending $250K a year - or maybe $10 per round seems like too much to spend, proportionally speaking......