Because i have a Sun system that works well and that i hope to use it
for the next three or more years. Took me a while and some money to
find the right working components.

But it's a pain in the ass to see that i can't extend it when i reach
the limits in the future. I don't have problems buying a new Sun/Sparc
but there isn't anything out there that fits the purpose as good as an
old U10. Cheap, low energy consumption that works about 1 hour with my
small UPS and completely silent (12 db) thanks to replaced PC
components.

None of the new and noisy Blades are useable for my purpose.