>can I acquire 30 of the in an hour?  Can I
>spend one gaming session and have enough of those pots
>stockpiled so that I can easily make a hundred gank
attempts
>using them and not have to worry about losing them if I
die
>because they're essentially in the bank?

Not sure about 30 in an hour, but they're not that expensive. 
But, then again, neither are detect invis preps. I want to say
the invis potion I'm thinking of costs about 2x what the most
common detect invis prep does.