So if we use Miles Morales as an example, which sold "only" 450k copies: the lowest sales price has been 30 USD, minus Steam's 30 percent cut (actually 25 and 20 percent for sales above $10 and 50 million respectively, but keeping the math simple), results in revenue of $9.45 million. If you use the base price of 50 USD, then it's $15.75 million.
With a PC port budget of $1.5 million, that means a profit of $8-14 million, or return on investment of 530 to 930 percent.
"tHeY mAy As WeLl NoT eVeN bOtHeR!!"