Well,
if you have a Tyros 2, a Motif ES rack, a Fantom XR fully expanded... there are lots of acoustic instruments already sampled to resample...
As for the Akai import function, it's useful indeed, but I prefer to convert their sounds to -wav format (using a program like Extreme Sample Converter) and then work on the single waveforms to reduce them to a reasonable size. This is even more important for samples in Giga format, that can take up LOTS of memory: there are piano samples where each note lasts for twenty seconds or drumkits where each instruments is sampled at six different velocity levels, which is fine, but what happens when you have a cymbal sample where each one of the six layers lasts for fifteen seconds?