There cannot be more buyers than sellers as each contract has a buyer and a seller. You may say though that buyers tend to pay the ask, hence systematically overpaying for options.
Obviously... However, what I am referring to is different. If everyone makes their bids/offers with the expectation that the audience of buyers is bigger than the audience of sellers, prices will be systematically higher than fundamental value.
I don't think it's true for any market ( and symbol ) . I don't believe that in all markets the buyers are willing to overpay for the insurance ( puts ) .
