As summer goes on convertibles get less and less, more want to buy, less sell. If you want to sell you wait until the open top driving season is over, more become available in October onwards but less buyers. Lowest prices December through March.
The G29 is a very good open top tourer, looks good, comfortable, plenty of space for full luggage, cars tend to change owners every 2 or 3 yrs as owners tire of the toy and move onto another. I plan to keep mine as long as we want to do open top touring, there isn't anything else that fits the bill for us
Because production has stopped good cars will depreciate less, mechanically they are good with very few issues showing yet