Even the pricey seats which we can assume are all on PSL and season ticket deals are very empty.
If fans lose interest in going and watching, which isn't hard to do with a team that bad and the prices associated with going, those tickets end up for sale online and in a market like SF that's worse than most places because they have people from all over the USA living there who would go see "their team" and it's a great destination to visit for out of towners.
There are a handful of cities that face that double-edged sword IMO.