Parking Ticket Contesting - Invalid Reasons

Generally invalid reasons to contest parking tickets:

I only parked in that space for a few minutes.

I didnt see the sign.

Im not familiar with parking regulations.

I didnt have change. Or I was going to get change.

I did not intend to park illegally.

There aren't enough legal/convenient parking spaces.

No one else received a ticket.

I have never received a ticket before in the area.

The fine is too much.