Wiring Cap pack parallel to ESC wires?

[ruudxd]

Sorry to bother you again, but I did some other research on a Dutch forum, and found out that boating guys use cap packs to, like this one:

http://www.tfl-hobby.de/product_info...3-000--f-.html

But does anyone know why they can use thinner wires?
The wires on the pictures don't look like 10 gauge wire, but the ESC's I have seen used are 220 amp ETTI's, Castle's etc?
Not that I do not trust you guys, I deffinetly trust you guys, and appreactiate the tips and advice, but I was just qourius?