US racing markets (or the lack of them) on this exchange are becoming a complete joke

From Monday to Friday there are hardly any US racing markets on the exchange between 6 -10,and this is despite there being plenty of US racing markets to bet on on their Sportsbook.

Betfair seem to be trying their best to make punters bet on these markets on their sportbook and to me as they are supposed to be a betting exchange I see no conceivable reason why they refuse to offer these markets ,and as I am 90% a layer I consider this nothing but contempt for their customers.

This whole website is becoming an absolute joke,from their numerous mistakes/errors on the markets.