Saturn V was cancelled in 1968.
Back then, there were no commercial entities designing and launching satellites. The first two Telstar comsats were basically international collaborative experiments between national-level telcos; Telstar didn't actually get under way with operational comsats until the 1980s. Similarly, Inmarsat, the maritime comsat company, was founded in 1979. The first GPS prototypes weren't launched until the 1970s, and the civilian use of GPS didn't take off until the late 1980s. And in the 1960s, the only people with Earth Resources Satellites were national-level spy agencies.
Short version: civilian space applications barely existed until 1-2 decades after the Saturn V was cancelled. The current efflorescence of communications, positioning, observation/meteorology, and broadcasting satellites were foreseeable and foreseen, but the entire manifest of commercial satellite payloads through 1990 could probably have fitted on top of a single Saturn V (although the need to deliver them to different orbits, over a 30 year period, would have made this a non-starter).
Finally, NASA had a program for Apollo science missions (from 1966 onwards), the Apollo Applications Program:
https://en.wikipedia.org/wiki/Apollo_Applications_Program
Only two AAP missions eventually flew -- Skylab (plus three crew launches aboard S-IB stacks, and a spare "lifeboat" stack), and the Apollo-Soyuz Mission (IIRC ASM used the "lifeboat" stack for the US flight). The proposed Venus fly-by was cancelled, the Saturn V launcher to carry the Viking Mars lander was cancelled, and so on.