How to predict crash in bitcoin price or any bubble in general? It's not all random and some guys seem to guess right when that happen. Any tips or insights?

I recently checked a few bitcoin donation addresses of bitcoin services and noticed the low amount of donations.

MultiBit has received ~ 230 donations (45BTC) since 2012. According to their blog they had 70k downloads in April 2013. I cannot believe that less than 1% of the users donated.

Bitcoinity has received ~185 donations (20BTC) since June 2013. There are always ~5k users connected to their service. So maybe 20k people who use the serivce and again less than 1% donated.

Same with almost every free service: ClarkMoody/Bitcoinwatch/Bitcoincharts/BlockExplorer/Coinflow/Bitcoin-OTC

Am I missing something? Otherwise I thing most bitcoin users are greedy/pathetic/inconsiderate.
Most people here made quite some money with bitcoin so a few bucks shouldn't hurt.

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如果年底前比特币创出历史新高。。。将意味着。。。

- 比特币将变得家喻户晓。一次可能是意外，而梅开二度绝对不是偶然。

- 比特币将全面进入社会主流的视线。如果能在不到八个月的时间里收复巨大跌幅的全部失地，其影响力无异于一颗氢弹。

- 比特币的不死鸟特征确认无疑。不论多深多惨的暴跌都不能杀死比特币。

- 比特币是庞氏骗局的论调将不攻自破。因为所有的骗局只能展现一次，所有的泡沫也只能是一锤子买卖。

- 大众的资金、机构的资金将会逐步进场，乃至大举进场。

- 正如某国外网友指出，比特币就是货币中的蜜獾。蜜獾是世界上最为勇猛的动物，一头蜜獾有能力从三头身躯硕大的狼的嘴下抢下食物，还能轻而易举的杀死眼镜王蛇，吃起眼镜王蛇来就像嚼香肠。

April:
7th - BTC rose $20
8th - BTC rose $24
9th - BTC rose $44
10th - CRASH!

October:
17th - BTC rose $6
18th - BTC rose $20
19th - Trading hasn't finished, but it's looking like another $20 day.

This rapid rise is accelerating at an unsustainable rate.  When will this bubble burst?

http://astrohacker.com/ahc/bitcoin-is-the-economic-singularity/

After reading this, the scale of black market and digital economies and the effect Bitcoin will have on them I am pretty certain we are going to be very wealthy men -- even with a sum as small as 10 Bitcoins. It's just so hard to believe. We are only in the beginning storms with these significant rallies from 10 to 20 dollars. I will not be surprised to see prices from hundreds to thousands in the coming months.

The world just isn't going to be the same and we have been blessed as the pioneers.

What are you going to do with your Bitcoin wealth once your coins hit upwards of $10,000 a pop?

They initially seized 26,000 bitcoins from Silk Road:  $4.16 Million in Bitcoins

They also have Silk Road guys wallet but haven't accessed it yet:  $90 Million in Bitcoins

They seized 700,000 bitcoins from the Ponzi Scheme guy:  $112 Million in Bitcoins

So conservatively, the US Government has stolen and is holding nearly $207 Million in Bitcoins right now.

At $160 per coin they're holding about 1.3 Million BTC.

All it takes is one person with an IQ over twelve to tell them to "Hold on to it because it'll probably go up in value" .... They're not dumb.

BTC在中国的价格已经独树一帜了，在丝路被封时，没有明显跟风。
BTC在中国应用比较少，大家对其投资或投机，都是对它长期看好的，只要中国政府不打压，BTC价格不会低于国际平均价。