Why there is limited sharing in Buddhism

I found there are lacking of Buddhism knowledge sharing in Temple or some close friends. The temple would rather be superstitious like worshiping, or more commercialize or like a tourism place. I was taught by one of my teacher that Buddhist needs certain level of credits or faith to study it. It was written in the Mahayana Sutra opening verse too. "Is difficult to encounter throughout hundreds of thousands of millions of kalpas" https://www.fgsitc.org/wp-content/uploads/2017/12/Ksitigarbha_Sutra_ChiEng.pdf . My personal findings we are still following the Treravada traditional of teaching where Pali languange was a royalty, the kingdom officer or the rich spoken language so it's not easy to encounter. I think what I was meant by this statement "Is difficult to encounter throughout hundreds of thousands of millions of kalpas" Scholars consider it likely that he taught in several closely related dialects of Middle Indo-Aryan, which had a high degree of mutual intelligibility. https://en.m.wikipedia.org/wiki/Pali Does it a truth or where else Sutra mentioning that sharing of Buddhism shall be limited to certain people?