Could free tickets be the wave of baseball's future?

Five thoughts from the third week of the baseball season:

1. Don’t charge people for tickets

Here’s an idea no one’s thought of before:

Instead of charging $30 for parking and anywhere from $30 to $120 for tickets, why not just open the doors and let in everyone free and watch them spend all their money on concessions?

Leave it to the Oakland A’s, one of the game’s least successful franchises, to do just that.

The A’s have given away all their tickets for Tuesday’s game against the White Sox in celebration of the 50th anniversary of their first game in Oakland. Parking is always free on Tuesdays, adding to the cheaper-than-cheap outing. (On Monday, when the Warriors play a playoff game next door…