The highest I ever paid was ~$510/BTC for about a third of a big one.
Bitcoin is supposed to be for everyone, not just the wealthy, so are you comfortable spending $50 (for example) for less than 0.1btc?
Have you ever paid more than $700/BTC for any amount of Bitcoin?
Maybe it's a good fact about me but I don't buy bitcoins at all, I do many services online and one good reason is the signature campaign since I joined this forum but the maximum that i remember was at $320.