If you have 100mb of junk, it won't fit in my browser's http cache either. And that's a good thing, there are other sites I visit that are more important. However, a browser is within its rights to detect that its user uses a site so heavily as to justify increasing that site's cache allocation. That's a QoI detail.
Note that if 70% of your 100mb is duplicated framework, it's possible that a better implementation of your site could fit into a 25mb cache...
