I guess it was just bad management. Here is what a band needs to do in order to get a work visa in USA (took this from the Opeth mailing-list):
a. submit the necessary paperwork yourself including correct forms, 30+
pages of media proof regarding your band in English, along with personal
information on each band AND the fee. It is a very difficult process.
b. You pay a professional company to do everything for you. They hold your
hand and guarantee your Visas. Cost is approx $1,300 per band just to hire
the company.
Now, at the moment, you have to submit your paperwork 5 months in advance in
time for the goverment to process the paperwork. However, you can pay for
"premium" processing and get your Visas delivered to you in 2 weeks. Cost is
$1,000.
Of course, then you have to tack on the embassy fee to process the Visas
plus the passport charge as well.
The bottom line is that some bands can afford the $2,500 bill and get their
stuff in 2 weeks. Otherwise, you are gambling as I assume LC did..and lost.