Breakfast/ Dinner with Elon Musk or 10BTC ?
10Btc yes! yes! yes!
One breakfast or dinner with Musk isn't really worth 10 BTC trust me. If it could have been like spending 6 months with him it would have still made sense as you would have got that knowledge and experience staying with him for this much of time. But 1 dinner you won't even get enough knowledge for yourself in that time to earn those 10 BTC so undoubtedly the Bitcoins.
Even the 6 month to spend with is not a guarantee that the knowledge that will be gained is worth 10btc. 10btc is a lot of money that if one misses the opportunity of having it may never come back in a life again. Investing 10btc can generate more money in my life, knowledge without money backing it up is nothing sometimes.