No point to commit to buy 21,000,000 bitcoin for these reasons:
1. It makes people commit for ridiculous low prices.
2. Only the top commitment has meaning (anyone under him is irrelevant)
3. Bitcoin is much more valuable if it is backed by a community and not 1 big whale.
Solution:
The commitment should be for a minimum amount, for example 100 bitcoin.
I back Bitcoin … I promise to buy 100 bitcoin for 10 USD per btc and to not sell them for less.Now we just need to find 209,999 more people
![Cheesy](https://bitcointalk.org/Smileys/default/cheesy.gif)