These are very generous consultant pitch #s not reality. We doubled running 1-$200k/guy … 2x full stack devs (me) 2x data guys 1x MSP for IT.
That team was awesome and did serious buzz saw damage because we shipped solutions that made the company better every day.
Didn’t have to be huge. Just help someone do something better.
I don't think the numbers OP chose really matter. The point is to do the exercise. Try and work out some numbers on how much the current software is costing, how much room there is for improvement and how much investment it will take to get there. Add a big margin to account for all the uncertainty with building something out.
If the numbers still work out significantly in favour of writing your own software then it may be a project worth considering.
That adopted mentality pays off tech debt fast.
At least that's how I feel about team sizes.