Larry, from the people I know personally who are Jewish, their answer would be.....
It is a Jewish custom to leave the -o- out of G-d and L-RD. The main reason is :
Because it makes the words G-d and L-RD unpronounceable. They can read the names and know Whom what they mean, but cannot pronounce them. The misuse and abuse of any of G-d's Names is anathema [“accursed”] for a Jew. During the third century A.D., the Jewish people stopped saying this name in fear of contravening the commandment .........
"Thou shalt not take the name of the LORD thy God in vain" (Exd 20:7).
I thought there was more background on that besides this. I remember in Jewish school this was typical, but I thought there was more beyond it. I could be wrong.
Though I don't see how this is a bad thing either if it is intended with sincere reverence.