On an interpersonal level there will always be rivalries in any field. It's more a question of the relative number of friendly and unfriendly rivalries, what people are willing to tolerate from rivals in order to acheive their aims and objectives and the politics at an organisational level that have changed. In the early days I'm not sure that you could call even the promoters 'organisations' as they were all really one man bands.
As other people have said money changes things.......although size also changes things. Smaller communities are always likely to be more cohesive than larger ones