FUNNY THING to be complaining about weight of a lens like the 75mm 'lux compared to the weight of a dslr kit....all things relative I guess. I agree with you Richard, if you need the DOF options given by this lens, NOTHING else will do and the justification of having it outweighs [pardon the pun] its heft. For stage or indoor use, or portrait use where limited DOF is desirable and NOTHING else will do like a 90mm 'cron [not much heft saved here] then there in lies the NEED for the lens. I too, wish the seller good luck and will most likely have no problem selling it....
IN general photography use, these advantages aren't as important and someone who does NOT really need the 75mm 'lux can look elsewhere. To the " joke " comment, one should really try to ignore lots of this rhetoric in the forums as much as possible. All to often I tend to get my back up with this nonsense also, I try to remember needs are different and so is someones experience, tact, and finances. All are understandable for the position of seeing it as a "joke" but a little more common decency would go far in many posts in most forums.
For a poor mans' alternative one might have to settle for a 50mm 'lux or the 90mm 'cron and be happy with that...all in all, not so bad a choice either...