Weight Obsession: A whole other level...

I knew there were Weight Weenies out there that like to compare weights and shave grams off of various components.  I even new there were a lot of people out there who purchase items like a Park Tool Tabletop Digital Scale. Here's what I didn't know, there would be a market for a JosephJoseph folding compact digital scale that you could take with you.

Pretty sure it was designed for cooking but...

Here's what I don't quite get; where are you supposed to take it?  To your friends house to weigh his components?  Do you take it to the bike shop to weigh random rear cassettes until you find one that is two grams lighter?

I'm sure there are great answers, this noob just can't think of one...