Mgram and SeaFan.. I think the problem with the horsey "pool" arose because one group grabbed one horse and started decorating, then another group grabbed another and started decorating. After the one group of people decided the horses should be pooled, they didn't discuss it with those who were carting around the other horse. Just assumed.
Too bad actually, but the last time we had a group large enough to purchase two horses, we had a friendly rivalry that was fun. We had horse napping going on, with ransom notes sent etc. Both ways can be fun.