Hello,
I can help you with changing the range of the cost in the filter bar.
The Cost Filter takes the values from the Cost Field in the Events. So it builds the range depending on what events it finds.
Can you please verify with the Event that costs $200.00 that you have that in the Cost Filled in the Event Edit Page. Here is what the field looks like.

If it is there we will have to do some debugging to why the Filter Bar is not picking it up.
Please let me know what you find out and we can go from there.
Thanks