How much profit you can make will depend a great deal on your profit margin. Especially how your profit margin compares to your competitor’s margins. I see that in your case the margin is very high.
I think your biggest problem is going to be finding a decent ad program that will accept your website. I’m positive that the 1st and 2nd tier programs will reject your website. And it’s hard to not get ripped off by many of the 3rd tier ad programs, so in your case, it will depend on whether you can find a decent 3rd tier ad program.