Yes, there is absolutely a point. Every Pokemon on the VR is ranked for a reason, they all serve a purpose on a Monotype team. Keep in mind that the rankings are relative to each other. Meaning, a Pokemon is ranked based on how good it is in relation to the other Pokemon within the ranking system.
Just because a Pokemon isn't S or A rank, that doesn't mean it doesn't have a niche or reason to be used. For example if you look at Dragon VR, Latias is B rank and its niche lies in its ability to use Healing Wish, which can support a specific win condition on your team (such as Mega Altaria), while still being able to provide bulky fast support along with Defog. Hydreigon is also B rank and is extremely effective in helping with the Psychic matchup thanks to its pivoting with U-turn and STAB Dark-type attacks. If we move lower down the list to C ranks, Dragalge is very bulky with an important neutrality to Fairy while possessing the ability to provide Toxic Spikes support, Mega Garchomp is an even bulkier alternative to Garchomp while proving more effective in the Steel matchup, and Salamence can be used as a Dragon Dance win condition. These 3 are only C rank though, as their niche is less generally useful compared to the higher ranked Pokemon.
Essentially, as you move lower down on the VR, Pokemon become less widely useful, and are more for targeting specific match-ups. Therefore, if you're only laddering, then yeah, you'll tend to see mainly the highly ranked Pokemon as they find the most general match-up use. But, if you're looking at tournament play, you'll start seeing more and more lower ranked Pokemon as people tend to build to target specific match-ups, based on what they predict their opponent using.