I tried to sell a Corvette on ebay a few years ago. The only offers were low-balls from people wanting to flip it. BAT will give you a quick sell (7 day auction and a few days to complete the transaction) but you better be active on their comment section (and have thick skin) if you want to get a decent price. Low mileage, unmodified cars seem to do well there.
I would put it on here, national audience of knowledgeable Lotus enthusiasts. Or take it to your local cars shows and put a for sale sign on it. I have a few people offer to buy mine at shows (and it is not for sale).