I know in the Harley and cruiser world in general, much of the weight sits on the rear, so those riders tend to favor the rear brake. Maybe the PO was a Harley transplant?
Maybe so. The rear disc on a Harley is actually the same size as the front disc so not only is there more weight on the rear, the brake disc is larger than on most sports bikes.
Which all reminds me of a funny story. My buddy Rick was buying a mint Ducati 748R a long while back. He asked me to ride down with him to pick the bike up so I could help load it etc.
When we got there, the bike was in the parking lot of this apartment complex. It was also all wet. Not too difficult to conclude it had just been washed. (I don't know why people do this.) Turned out the guy selling the bike wasn't there, but was deployed to the AOR. His wife was selling the bike for him.
So as Rick and this lady go inside to take care of paperwork and money transfer, I'm walking around the bike just looking it over. It had (no kidding) less than 1K on the odometer. I happened to look at the tires to see how hard it had been ridden and the chicken strips were well over an inch and a half on the rear tire.
As I'm looking at it, Rick and the owners wife returned. As they chatted, Rick asked why they were selling such a stunning motorcycle. Her reply was, her husband "thought it would handle better than it did"
At that point I just looked down. When I did, I noticed the rear brake was burnt. I mean the disc was the discolored blue/gold/purple of metal that had been heated to near glowing red hot.
She got a cell phone call right about then and walked away to take the call. I pointed out both the immense chicken strips as well as the roasted rear brake to Rick. He looked at me and said "why would anyone use the rear brake on a sports bike like that?" I suggested he was probably a Harley rider and because he didn't use the front brake at all (it was clear it had NEVER been used in anger) he'd never gotten it to corner the way it should have.
Turned out, the call was from another buyer wanting to see the bike. The owner's wife came back and Rick says "so...you guys have other bikes?" She says, "Why yes!! We also have a Harley." I just looked at Rick and grinned.
After we loaded the bike and got on the road for home, we high 5'd because we both new this bike had yet to be ridden hard. It was essentially brand new save for the roasted rear brake. He got a screaming deal on the bike.
One ride around the neighborhood where he lived and there were no more chicken strips. I think he ordered new rear pads and a new rotor the next day. The point is, I agree with Saabnut. The PO was probably a Harley rider....sean