It is because the only professionals in the sport (in the UK) are the riders...
The rest are well intentioned amateurs doing their best to appear professional, but often without the necessary skill set required to carry off the tasks they have been asked to do/volunteered to do..
The professional marketing of the sport as a collective, rather than going it alone at each club in a small way, and the governance of the sport through the use of a credible operating model, is, sadly, a huge opportunity never taken up by those "well meaning amatuers".
Hence, being insular, working in secret, and deep mistrust is often the reputation earned in the opinion of many of it's current, fanbase, and (probably more importantly), its ex fanbase, who still follow the sport closely...