Why do you think billionaires can't "find joy" in those things you mention, such as drinks with friends? I would imagine that entertaining their family and friends is probably one of the main things they do, either in one of their many homes, or their yacht, or renting a huge holiday home and inviting everyone for a week of partying, etc. Even moreso as they'll probably employ their own chef and waiters (and cleaner to tidy up aftewards).
Personally, I'd love the idea of having a private jet or helicopter to take me places so that I can avoid traffic, airports, queues, etc. A helicopter to take me to places like Silverstone for the formula 1, or Glastonbury, etc would be awesome to avoid the road traffic and queuing for entry!
I'd get pleasure out of my fleet of classic cars such as a ferrari and lamborgini rather than a scented candle.
Having several homes all over the World and being able to spend a few weeks in one then moving on to another on a kind of carousel would be awesome. I'd love it. A home near a big city for when I needed to work with meetings, etc., and then "relaxing" homes in other places where I could have fun. Basically, "chasing" the seasons around the World, so I could "move South" for Winter to avoid the cold Northern winters, and then move North again for the Summer! A home in the middle of nowhere with just rolling fields and hills as the view for some serious chill out time.
Some billionaires build their own fairground, or full sized steam railway, or their home has a built in gym, pool and spa for "lazy" days with your friends. Maybe use the money for an expensive hobby, like learning to fly (proper sized planes) and then buying your own home with a runway and buy a couple of proper planes to fly yourself (As John Travolta did!).
I'd certainly never get bored, and certainly never miss "little" things like buying a candle because I get no pleasure now out of buying/lighting a candle! There's so much that I could do with serious money. So many places to travel to, so many places to have multiple homes, so many different hobbies and interests, so much new learning to do.