The question you pose really isn't logical. If he was there to rape, why would he have bothered to take any money? In that scenario, the culprit would have cared about sexual gratification, not financial gain.
If this was a sex crime, and if the culprit went through the purses, he was probably looking for trophies or for something that would arouse him sexually (like a diaphragm).
Many people traipsed through the house. The crime scene was compromised, so it's impossible to know whether there was deliberate staging.
Most people assume that the crime was either connected to the grave-robbing trial or sexually motivated. In the first case, Suzie would have the target. In the second case, Suzie would have been the most likely target (because she lived there), but Stacy can't be ruled out. Sherrill would have made a very unlikely target of a planned sex crime. She could have been targeted for a different reason, but people are playing the percentages in saying that she probably wasn't the target.