It is quite understandable to not want to keep stocks of
equipment that is out of warrenty.

The profits from replacements parts do not justify keeping
them in stock.

Imagine if a run of 200,000 32 Inch TVs is made. Do your really
think that any manufacturer wants to (or can afford to) keep
200,000 spare LOPTs in stock or 200,000 spare power switches ;-)
or 200,000 spare CRTs??

Most equipment is out of date after 3 years and the cost
simply cannot be justified.

JVC have this down to a fine art.