What's it worth? As an example,
BBTS was clearing them out for $59 back in 2006, 3 years after his release.
http://www.bigbadtoystore.com/bbts/p...73&mode=retail
That equates to $68.12 USD or $66.51 AUD if you could fast forward and wanted to buy the same toy today.
Original BBTS price of $79.99 equates to $92.36 today.
However, when it comes to current markets:
Average eBay price today is give or take $267. Highly doubtful you'll get anywhere near that figure. Lowest priced one IIRC was $130 odd.
Keep in mind though, that Hasbro has released him again, and although the missiles are longer, he can be purchased for $80 from RobotKingdom.