Aside from the concert pianist stuff that's been covered
I think it depends on how literally you meant use your ability to play.
e.g teaching isn't doing that - unless you're going to spend 50% of the lesson showing off to the pupil - in which case, you might want to consider electric guitar instead - otherwise, chances are you'll be playing little bits to demonstrate and spending most of the time listening to others play.
Of course you can still play - but you could do any job and still play.
If you want a job that involves playing the piano, there's probably a wealth of session musician type stuff, TV stuff [someone played the piano for that Stella Advert for example, someone plays piano on all those Simon Cowell / BMG records] or a rock band / Elton John type thing - you could be the next Richard Clayderthingy, Billie Joel, or Rick Wakeman - but you might run screaming or turn your nose up - I would think of it like this - If you earn $50M playing crap for 10 years, you can buy a Bosendorfer, an island in the sun and learn / play / publish whatever you like for the rest of your life with that money.
There's working in the background too, producers make big bucks for years while the pop / rock bands they work with disappear / get addicted to drugs / die - most of the 1/2-decent sounding pop/rock albums are down to their talent, not the band.
Your idea of speed == everything would appeal to Rick Wakeman's audience too, you don't even have to play difficult things fast, just fast. Can you grow a mullet, and do you need an agent?

You could get a job in a piano dealer / music shop demonstrating / selling them - depends how greasy and free of morals you are

If you can compose you could look at film or computer game composition - the latter is more a one man game, so what you compose, you play too. Similary TV shows have sound tracks - some TV series on DVD have the extra stuff that talks about the filming / special effects, a few have stuff talking about the music / composer - League of Gentleman for example - watch them and see if it appeals.
But if you're only interested in playing specific rep in the idiom of a concert pianist, then you've probably only got that choice.