The swapping of plugs thread likely refers to evening out the wear on the plugs. If you have a wasted spark ignition, both plugs fire at the same time, but one plug has negative centre electrode polarity, and the other plug has positive centre electrode polarity. Those tiny little electrons leave from the negative part and go across to the positive part. That means the negative part is the only part that the metal is eaten away. Therefore one plug has the centre electrode wear away while the other plug has the ground strap wear away. By reversing the plugs occasionally, the erosion will be evened out on the two plugs.
However, JimboW's use of Iridium plugs means he would have to drive his bike for maybe 100,000 miles to wear out those plugs.
730 miles in 3 years, means non-detectable wear on either electrode. Still the theory is correct.
The way that most people only drive these bikes for 3000 miles or less per year, means Iridium plugs (swapped over so the iridium centre electrode gets its share of being the negative terminal) will last about 33 years.
I've had the same regular NGK plugs in use, on my bike for about the last 7 years (14,000 kms), and having just looked at them, they have almost no wear. For the amount of driving I do with my bike, I just don't bother to swap plugs from side to side. I prefer to keep the same plug in the same cylinder so that I can monitor the combustion/mixture quality as time goes on.
Here is an example of wear:
Plugs 1,2 and 3 had negative ground straps, while 4,5,and 6 had negative centre electrodes.