Well, you're the rare exception. It would be obvious though, that buying into these rallies is indeed partaking in attempts at profit taking based on speculation.
No, not really.
It is the last stages of the bubble, the final 300% or so, that attracts people like you to participate. Most of the coins are held by long-term investors, who bought them at anything prior to March, 2013, at average prices of $1-$30. If they decide to cash out en masse, and newbies panic, we may easily see $30-$100 again. But no, it will not be an end of the world. During the whole 2012, bitcoin only rose less than 200%.
Have you been watching me!? How did you know I bought my long term gains under 30!? Granted I broke even today, but I just didn't feel like having my family worry about my buy in anymore.
I wasn't able to make a large buy at ~$50, but the run up made me not care. Now it's all house money, and I am just gonna let it ride. Sucks if I lose it, but it's not like I really lose much after that right?
I don't know if I am in the majority or the minority, but depending on what others like myself need, they might decide that they have made enough profit and just cash out.