$45 is probably worth it for them to have someone to hold their hand and
write detailed installation notes so that everything works. Remember if
you screw up you could well loose everything on the disk or the
partition, because it does not decrypt. (eg passsword errors, etc). So,
having the guarentee that "this works if you follow our instructions" is
a peace of mind that may be worth that $45.
They do NOT want to learn to be cryptgraphers inorder to protect their
systems. Just as they hand their money to buy mutual funds, because they
do not want to become stock experts inorder to protect their money ( and
that costs them far far more than $45 a year).