I think Mr Davis was carefully trying to avoid ruling anything in or out in his answer, in accordance with stated government policy of not revealing the negotiating position until the talks begin.
I see no need to offer any continuing contributions to the EU. Isn’t it odd the way some in the media has leapt onto a non statement and drawn the wrong conclusions? The one that took the biscuit was the idea that the pound rose against the Euro on this “good news”. It was neither good nor news. The pound has been rising against the Euro for several days. The FTSE fell today, so why didn’t they say “The FTSE fell on fears that the UK would still have to contribute to the EU after exit”, if they were determined to use this wrong story?