Internal Speaker Wiring ??

I just had occasion to pull a driver from my Thiel 7's and was quite surprised to see what looked like a rather "wimpy" wire connecting the driver to the crossover. It made me wonder if the "weakest link" theory applied to internal speaker wiring. In other words, am I foolish to spend hundreds of dollars on amp wiring and speaker cable when there may only be garden variety wiring inside the speaker ??