I apologise in advance if this offends, dear Rick but ............
I agree with Region2 for the following reasons:
In my experience AS has failed to bid on a couple of occasions for me. Not "must haves" so of little consequence.
A "must have" is a personal decision, but on the whole I feel "must haves" are sensibly assessed by most people.
I bought a "must have" lens tonight. Why? As I am due to photograph a friend's son's wedding in a fortnight and I need a wide angle lens, it became a "must have". Yes I looked, this particular one comes up about every six weeks or so, hence the sudden burst of decisiveness! Did I let AS bid? No, because I didn't want any glitches - I bid early & high!
The only other times I rate an item "must have" is if its genuinely rare. In that case I let AS bid, but also - if it ends at a time I can get to a computer, I'll add manual bid for luck.
Belt and braces? Yes, but if you really want something, then it pays to be cautious.
Paul