Black Zarak is all the rage on TFW2005 now, thanks to this thread "G1 Holy Grail Owners discussion group" and the private invite only group that was spawned from the thread "G1 Holy Grail Owners".

There's lots of discussion in the "G1 Holy Grail Owners" group about Black Zarak and there are about 2 or 3 "grail owners" actively and fiercely looking for one. And because the group members are getting slightly competitive (my impression anyway), many just want a Black Zarak. There are already at least 3 members who've whipped out their Battle Gaia giftset and one that whipped out Guard City giftset... so its an uphill battle that cannot be won by having just one grail! hahahaha.

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On another note, I have been speaking with Rampagess and Bruticus in relation to Black Zarak (heehee, update soon, I promise) and Bruticus worked out for me that a custom Black Zarak would cost approximately $700 to $800. I'll let him say more when he sees this thread, but I believe that to be an accurate estimate in today's market conditions, and the general value that even a complete Scorponok is going for. I remember someone selling a complete Scorponok for AU$400 here awhile back.

To put that in perspective, I've seen MIB BZs on eBay going for US$2000 to even a high US$3200 (I did a search of past threads where Rampagess cites BZ eBay auctions). Personally, I know that KSGJ03 sold one last year for US$2500 (shield tab broken) and one more earlier this year for US$1122 (but missing a few parts and broken). There is one on eBay now with a BIN of US$683 (thereabouts), but its missing all the key important bits.

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Back on the question whether you should sell. I'd say no if I were you. I get sentimental on stuff even if I've just done things like removing all the stickers, giving it a general clean and reapplying all the stickers accurately. So I'm probably not the best person to answer this question.

An accurate answer would come from customisers who customise and then sell their products on a regular or semi-regular basis.