I'm a passionate amateur photographer, and after a bad crash where I lost years of work I became really neurotic about my multi-site recovery plan. Today I have Drobos and Time Capsules spread around my house and office, plus Dropbox and even a few rsync cron jobs all keeping me calm.
Today, my Aperture library is 109GB, because I work with archival scans from medium format film.
TL;DR: 100GB is a very small limit. How can I pay you more?