I chose 75% even though it's closer to 95%. I believe bitcoins will keep growing in value and would like to save more but, unfortunately, I don't have the capital necessary to continuously be reinvesting my own money into a Bitcoin only business. In other words, revenue goes right back in.
I'm doing something of the same by cashing out 25% - enough to meet most dollar expenses (t-shirts, shipping, envelopes, etc.), but keeping the profits in btc because I'm also long-term optimistic as to their value.