BINGO!!!!
different qualities of weed travel through different channels and rarely overlap
people who get/have low grade weed rarely ever see the high grade stuff... they might see some better than average... but they will almost never see the truly high quality shit
and on the same note people who get/have high grade weed virtually never come in contact with low grade stuff... many will be offended at so much as the idea of getting low quality weed... hell most of the pot heads i know would honestly rather not smoke, than smoke low grade stuff...
me personally... im not that into it... but i can appreciate good stuff... i generally dont bother unless my friend tells me that its something life changing... then ill take a hit or two
i do enjoy chewing the fuck out of a nice stem from time to time though