I can confirm that currently once you hit lvl91 the HL players see you. From what I understand the level used to be lower, which potentially indicates as the game fills up this level might rise.
This is another reason to really slow down on your leveling. If you focused on building hood defence it all becomes worthless when the HL's see you unless you can buff it up to at least 15-20k building defence. The other problem is robberies have suddenly dried up as your now fighting for respect with masses of other ppl. This is obviously a problem as you don't want to be going from hood to hood just to find level8-10 LM's to get respect from. It will make the game very dry for you very quickly.
With Tramp Stamps discovery regarding payouts and the ability to plan an income based on ROI it greatly puts the emphasis on making the perfect high income to taylor your needs (means you have more $$$ for more upgrades/buildings/expansions/ and usable $$$ weapom/armors). So if your approaching level 91 I advise to seriously think about your hood and mafa goals because defending against robberies isn't going to happen and farming respect becomes even tougher.