Call me old-fashioned, but I liek it much better when there's a clear graph with everything on the X and Y axis defined.
I also just don't like the design of the graph you currently have, way too simplistic and bombastic for me.
Also, the design of all of the information under the graph is a bit too underwhelming, everything is just plain black, the text/title size and spacing seems a bit off to me.
It's a good start, but you really need to upgrade the overall look and feel.
Same observations and opinion on the site but its not really bad either but its too way simple and I don't really like too much the size either on the chart or on the size of the Text showing up the price.I do still appreciate the effort made by Op but there still lots of time to develop and make some changes to the site which would possibly make some popularity later on. Goodluck