I don't think it does. You have still the issue of the unhappy monster once everyone else has hit the "max" utility. You would spend all your resources on them rather than improve things for the rest of the group because they are now deemed unimprovable.

You don't get anyone hit 0 or 1. (Compare with probabilities predicted by a sigmoid - it never reaches 0 or 1.)

Loose eyelashes vs factory farmed human flesh.

Both are finite pain/finite negative utility.

How many of the former must be avoided to equally balance the creation of one of the latter?

Question: how is that mathematically different from bounding by negative & positive infinity?

sigmoid(x_1 + ... + x_n) != sigmoid(x_1) + ... + sigmoid(x_n)

No, as long as one entity can derive exponentially more utility than another, utility monsters are possible; such monsters cannot be satisfied only with polynomially many sacrifices.