No, a cluster consists of 4x SM100, and $38 profit is per card, so after 10 months you already have $1.0 million.

I haven't accounted for 7 hours of peak-pricing per workday.

Of course, you won't have 100% utilization.

For four cards at 100% utilization it's $4712 per workday and $3648 per day on the weekends and holidays.