Hi Alex,

Thank you very much for the detailed facts pertaining to your inquiry.
You're absolutely right that these massive increases have happened in just the last few months, and it's a big concern on my own mind about the sustainability.

To be honest, what I was trying to communicate in the video on this, was that I don't believe we are in an all-cryptocurrency market encompassing bubble.

I DO feel that many coins are heavily overvalued, and especially when it comes to these newly minted tokens created from ICOs. These ICOs are taking in millions upon millions of dollars, with only a white paper, series of Linkedin accounts, and nothing to really show for the reception of this money. I agree with Griff Green- these ICOs should have "Achievement Milestones" all built in, which would only qualify them to receive funds out of the smart contract upon accomplishment of different goals along their roadmap. The way things are currently getting funded is a recipe for many of these coin's disaster. and it'll likely take around 1 - 2 years before many people get burned...but it's possible that these coins will pump along the way, so "early adopters" may not take as much of a hit.

It's very hard to tell where things are going, simply because cryptocurrency hasn't been around even a decade. The dot-com bubble was very different from cryptocurrency in that there were a lot more people playing around with money in that particular environment, globally, than there are people holding cryptocurrency. The number of people aware, and holding cryptocurrencies, is poised to continue a sharp rise...as adoption only seems to be growing, and articles seem to be flowing.

But make no mistake, some of these coins won't get much farther, and could be considered to be in "bubble" territory. Ripple comes to mind, because of the fact that 1 billion XRP will be released every month for only 4 and a half years- somehow people think this really affects inflation, but in reality the team said they were only spending about 300million a month, so this was merely a P.R. move so that the team could sell for a bigger profit, in my honest perception. Ripple seems ready to disappoint many people, and that is one cryptocurrency I feel is in a bubble and could pop.

The best way to avoid any anxiety about a bubble is to hold coins you truly have faith in fundamentally- I know that for me Bitcoin is way undervalued, without a doubt, as I'd projected the price still higher after the last "halvening" event.

Ethereum also has worked very hard to get to where they are at, and the lead devs seem to take no breaks in their efforts to improve the EVM.

Coins like Steem make it very hard to tell- the fact that power downs happen MUCH more rapidly than during the first major bubble last year leads me to believe that this may be orders more sustainable.
The price for Steem touched around 3$, if my memory serves correctly, at that point. However, there was also a MUCH higher inflation rate for your vested Steem, and for the APR paid to Steem Dollar holders. It was an extreme outpour of money, and seemed unrealistic at the time.

However, the biggest earners on Steem now are those who likely have quite a following, due to having stuck with it for a while (versus having just been whales that bought dirt cheap, and abused their Steem Power). Steem power still plays a big role, but I'm noticing that for me (as a content producer) it matters MUCH less than it did at the outset of my introduction to Steemit.

To wrap it up, I wouldn't be holding coins I don't fundamentally believe in. Those coins have enjoyed their pumps...it's time to cash out, while the going is hot (and liquidity high enough), and hold those blue chips.

Cheers, brother- thanks so much for the opinion, and for letting me clarify my own thoughts by way of sharing them with you :)