I'm normally quite the skinflint, but I wasted 800-odd quid on a drone last year.
It said £750 but I didn't pay attention to the shipping info, which said it was coming from abroad, so I ended up having to pay the import duty. Then, once it arrived, I found out that it didn't work with my phone - and only my kind of phone - so I had to spend more money on a tablet to use it. I had some fun flying it around the nearby field - and only the nearby field, since a (disused) airport in the area means it wont work at all elsewhere. I looked into using it for professional video making purposes, only to find out that getting a licence is pisstakingly expensive and, even with one, using it for sports events, which is mostly what I get paid to shoot, is pretty much forbidden. Then the USB port on the tablet stopped working. I thought about getting a replacement, but decided it would be throwing good money after bad. Then all that guff happened at the airport last Christmas and the government now requires you to pay 20 quid a year to use one.
The drone has sat unused in its box ever since. I should really attempt to flog it on ebay and recoup at least some of the money.