Seller wants 30% down. Why?

[Jayson Greenblatt]

I put an offer in on a property the other day, the asking price was 360k. I offered 345k with 25% down and a 6 month credit for non paying tenant since eviction courts are closed. Seller countered with he would accept 345k with 30% down and no credit for tenant. I understand the no credit but why would the seller care whether its 25% or 30% down?