The Liberals probably figure, for the time being, they can rake in more cash on their Clintonesque pay-to-play scheme than money per vote.  Besides, dollars per vote would be a big boon for the CPC (32% vs. 40% Lib) who are the Liberals chief opponent (no one goes to pay-to-play events for the official opposition).

Having recently doubled down on pay-to-play, it's unlikely the Libs would back off unless the heat became truly unbearable.