Flowers are a terrible product to sell from an alternative extension. They are not a generic product where the quality can be guaranteed and the customer will need alot of reassurance on quality before ordering because it's important to a particular relationship they have. They will only get that reassurance online by buying from a bricks and mortar website or an established online flower retailer which is bound to have .com domain.
Buying flowers on a mobile phone doesn't make any sense, I have an HTC Desire handset, I carry it with me round the clock but I would never buy anything on it because I want to see big photos of what I'm buying, do some price comparison, maybe look at some reviews of the store, and I don't want the hassle of cranking through a long check out process with the delivery details and message as minimum and possibly my details and card details on top if its my first time using the site.
When I buy flowers when I am not at home or work, I go to Google.co.uk on my phone, I get the shop details up for the store I use near where a particular person lives, all I have to do is touch the phone number on the screen and the phone dials, I ask the shop what they have fresh in, maybe agree some colours and the price, read out my card details, recipient details, and message, and I am done. I have used the local flower shop before, I know I can rely on the quality and they are cheaper and better than networks like Inter Flora or big UK stores selling flowers as a sideline like Tesco or M&S.
The only .mobi site I use on my phone is a TV streaming site, I don't pay any subscription or give them my card details. That's the sort of site that is ideal for a .mobi. Other products that work are stock prices, maps, directories, price comparison sites, phone apps, mobile games, what's on guides, restaurant review sites, car park finders, anything where you can bring a page up instantly and it doesn't involve typing in personal details or handing over your credit card details.
With no back story, Flowers.mobi would sell for less than $5,000. With a $200,000 "miracle" sale in 2008, there is bound be some kind of rub with the auction so it wouldn't surprise me if it sold for a very big multiple of what it is actually worth.