Runners leaving early

[Dakota]

Under "Obstruction" thread on eteamz (which has become seriously multi-topic and difficult to follow), Sam (the coach) opined that it is very rare for runners to be called for leaving early unless they are stealing.

My experience is there is another fairly common occurance of runners leaving early -- namely when they think they can get away with it.

Examples include trailing runners with multiple runners on base. The BU will be focusing (they assume) on the lead runner, so they figure they can get a jump with little risk of being called. Typically, when I have seen this, it will catch the corner of my eye the first time, and after that, I will position myself so I can see both runners. I make this call several times every season.

The other example is runners on 1st in a single umpire game. Same thing ... catches the corner of my eye & I then watch for it (as best I can from behind the plate) after that. I make this call less often, but I called it twice last year in the same game.

So, I was wondering - what is your experience?