I know someone that hits 8000 a month regularly. I wouldn't have believed it but he showed me the data text thing that says how many you used for the month. After he showed me I would watch him more often and would notice he was literally always texting.
My Bill Statement said I sent 5242 text this month
-Usually its around 3000 or so text, but Ive been texting this one girl who always says Goodmoring and Goodnite to me and just always texting throughout the day and nite
I'm unsure how many I sent this last month (it says the information is unavailable because we recently changed our minute plan), but I do know back in the day I had to upgrade from 3,000/month to unlimited. I remember when 3,000 was the highest plan, AT&T felt an unlimited plan wasn't necessary.
Which is only 83 sent a day, if you take into account he's conversing with someone. So he could cover his daily bases of 83 sent messages by having a couple of long conversations with only a handful of people.