Pennies. As stated earlier in the thread, the 'revenue generating' point of the play-offs is nothing whatsoever to do with crowds from the knock-out games themselves. Its about 12-15 teams (instead of 3-5) having meaningful (and thus well attended) matches for most of the season.
The very, very, very obvious answer, to confer better advantage on the higher placed teams, is to leave it as it is, except (as is already the case in lower leagues) the semi-finals should be played as a SINGLE match, with the 3rd / 4th placed teams at home.
Its nothing to do with the money actually generated by the play-offs themselves. Its about keeping the season alive for two thirds of the league for most of the season.