Apple claims M1 Max iGPU is 4x faster than M1 iGPU.
M1 ethereum hash rate is 2 MH/s so M1 Max is 4x that so 8 MH/s.
https://www.tomshardware.com/news/apple-m1-chip-mining-ethereum
Lowest cost for Macbook Pro M1 Max is $3099.
For that amount of money you can get:
8 x $400 3060ti Founder Edition GPUs at 45 MH/s x 8 = 360 MH/s
or 4x $700 3080 Founder Edition GPUs at 85 MH/s x 4 = 340 MH/s
or 6x $500 3070 Founder Edition GPUs at 55 MH/s = 330 MH/s
or 2x $1500 3090 Founder Ediition GPUs at 120 MH/s = 240 MH/s