Clay,
Not to be making excuses for them but some of these are cottage industries where the owners also have real jobs in addition to supplying a service. Others are contest oriented and may be away at a contest...or in transit. Some are large enough to have people to answer the phone, I think most don't.
One picked up his phone on a Sunday morning when I called. I had expected to leave the order on his answering system. He happened to be at his shop to pick up some stuff to go flying.
Bear in mind that some are computer illiterate, or of limited knowledge, so must rely on others to maintain their web site.
Again, not excuses but possible explanations. Have patience, most are great people.
George