The highest price cake was the 1st wedding I did. I was only going to charge $175 for it (because I was new) but the Mom of the Bride said she liked me so much that she would not pay me $175 that she would pay me $250!! Honest it's the truth!!
I also did the groom's cake & charged $135 for it. So I did good for my 1st time. Now it depends on the cake as to what I charge. They are mostly all the same size so I usually make $250 or more on wedding cakes. Next year... I'm raising prices!!