What drives a commercial entity in this capitalistic world is maximizing profit.
There are clear advantages to making websites more concise as that may help clients return thus keeping them as valued customers. Often, for various reasons, suggestions such as these get ignored. Sometimes due to a lack of understanding but sometimes due to more emphasis being placed on an area deemed more profitable. What is most interesting is every person's different perspective on where the most benefits can be found. I personally like to keep an open ear out for suggestions since I realise not all the best ideas can come from a single person.
I might try to get into a person's mindset then describe my suggestion in their language as best as possible. If they still aren't very receptive then there might be an issue.