Some say they got the ping, some say they didn’t...so I don’t know. Some might not like multiple pings. It’s a pretty big list with only a few who post. I imagine many more lurk. It’s up to you.
If I recall from a long time ago I heard people talk about long ping lists have to be broken up because the To:only takes so many characters. How many I don't know. Maybe ask Jim. Also you have to keep track where you break it off so people won't get double pinged.