Do what i did with mine, park it under a lorry at 60mph, saves all the hassle of selling. Ok your neck takes a bit of a pounding
On a serious note, warmer weather makes more people look at soft tops, people who may not of considered one before start to see them on the roads and think "what if"? This is why the market is generally better from April to September.
Crazy ? Yes. Logical? Yes. Make sense? No