I've seen lots of stories of people doing this and then having the window smashed anyway because the thief doesn't even try the door first.
About 15 years ago, my aunt stopped locking her convertible. She used to, but people would slit the closed top to reach in and unlock the door to look for CDs and such to steal. A few hundred bucks to replace the top was way worse than losing some change and such. Then she switched to a late 90's Miata which had a lockable center storage bin/arm rest.
A relative of mine had to do the same. He's considering sticking those scary spring snakes in the center console as retribution.
A buddy of mine did this in his '70 Karmann Ghia, which, even if the door was locked, was easy to break into with a belt through the window that didn't roll all the way. Someone still broke the window and tried to steal the broken cassette deck that was in it. This was in the late '00s, so I'm not even sure what they were going for there. That cassette deck couldn't have been something you'd even readily be able to give away.