A friend always did that as well. He never had a problem, except in Yellowknife NWT. Someone removed the keys, not the bike. Cost him a $100 to have a locksmith make him a new key. Despite that, that didn't stop him from leaving the keys in the ignition.
I carry two spares because of this. Mine has been removed twice; both times by well-meaning friends. Of course they were not around when I was ready to ride; spares take care of that.
309 N. 3rd. Ave.
Kure Beach, NC 28449
1996 R1100RT main bike & 1985 K100RS...too fast to believe.