There are cheaper lenses and CCDs which might strike a better price/performance ratio too -- I think that was the original thought behind saying "100k is too expensive!".

Of course, those items you linked are beautiful machines of precision and quality. But maybe with a cheaper system, more targets can be tracked at the same time. So a $1k lens with a $1k sensor in a $500 tracker gets you 40 "telescopes" for $100k instead of 1~2.