RE: TSX 100 The TSX 100 explanation is simple to explain.
If you don't have a broker account and you want to buy some shares of a company you can purchase them through the TSX.
So you don't need a broker and you pay the TSX as a cash sale, and would get a share certificate from the exchange.
As you noticed you will normal pay a premium, as the TSX has to find shares available for a cash sale.
So somebody that doesn't trade regularly can get into a good stock with out a broker.
Chances are these buys would be for a long term investment.