We did a three way split stay, but it was mostly due to room types. We were flying down early and friends were joining us for a week, then we were on our own again. Instead of wasting the points to keep the THV the whole time, we decided to book smaller rooms....and figured if we are moving, might as well try different resorts while we were at it. Also, leaving early was last minute, so we definitely didn't plan it in the beginning.
We waited till we hit the THV to go grocery shopping (we started in a studio) and just packed the first 3 days of clothes in one suitcase. We had bulk of our clothes in suitcases for THV and washed/repacked the small case to be used for the last three days. It actually worked out very well, but I wouldn't necessarily plan this if we were staying in the same room type the whole trip. Plus, IMHO, no resorts have blown me out of the water that I HAVE to stay at them, nor any that I disliked that I would HAVE to move.