To start with, I have no idea what the answer to this question is with regards to the Swedish system, but I've found that in many cases of solutions like this the "cost" paid by end users is heavily subsidized in other areas (in the US it's so common it can almost be assumed). So if the $40 / month pays for all of the capital costs, maintenance, depreciation, etc. then wonderful. Otherwise it's just accounting slight-of-hand - put a happy number out for the public, and if somebody digs and puts together real costs then they find that the real number is horrific.
On the other hand, in the US most major metropolitan areas (there are exceptions) have sold monopoly or duopoly franchises on internet service, which also distorts prices horribly and in other directions. I live in one of these areas, as do most of the people I know (I get to chose between mostly tolerable but pricey Cox, and utterly abhorrent AT&T - for practical purposes just one choice). In many cases these "utilities" are limited to certain profit levels, so they just adjust their costs up. Competition isn't magic; it just incentivizes aggressive pursuit of the best cost / quality tradeoffs (which are usually subjective and may vary significantly between individuals, eliminating the possibility of a good "one-size-fits-all" solution).