If I keep upgrading, my 'second body' collection is going to make my wife beat me to death with a monopod out of my 'collection' of those...
I had Rebel XT and bought a 40D. The Rebel XT became my second body.
Then along comes the 7D2. The 40D becomes my second body.
Then along comes the 5D4. The 7D2 becomes the second body but doesn't get used much because OMG the 5D4 and FF OMGWTFBBQ.
The along comes the EOS-R. 5D4 says 'oh hell no' and the tussle ensues. The battle for primary body continues to this day.
Now R5 is on its way and the EOS-R and 5D4 and staring at each other and foot tapping..
Sell the wife, buy the mythical R7...problem solved