Cost. Relative ease.
To me, keeping a planted tank is almost like a fish-only tank. I don't really care of the parameters as long as I know I am not keeping fish(and plants) that require the extreme to survive. Thus, as I don't care about pH, hardness, the many different ppm readings of different chemicals, life is relatively easy for me. I just have to make sure there is as little algae as possible and there is enough CO2 and trim the plants as and when they grow out of hand...
For marine, such bo-chap-ness is not possible... I cannot imagine myself testing water for salinity, specific gravity, amount of trace elements, top-ups with reverse osmosis water, find distilled water, measure amount of salt, etc etc... Then the lighting also... With marine, one would think of buying corals etc, nice pretty fish to go alone, etc and these can often be difficult to maintain and feed...
Thus, for me, it is the ease and the relatively cheaper prices that keeps me from ever going to marine...(Though a simple tank with stones, algae and pipefish-look-alike and sailfin mollies is cool too
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