Out of interest, what is "balls deep" for you ?
Less that 1 BTC ?
1-10 BTC ?
10's f BTCs ?
100's of BTC's ?
Or, if you like you can express it as percentage of holding.
The thing is, I, like you, have followed the Etherium concept and believe it to be very promising, so I'm throwing a couple of BTC at it to have a "horse in the race". However, I don't beleive in going "balls deep" because:
[1] - the price could plummet as soon as it goes on the market, there is so much speculation involved and so much Ether about with nowhere near the utility value to justify it yet
[2] - if the price doesn't plummet and rises, at least we'll be along for the ride in some capacity
You can't safely go "balls deep" in anything until it's been trading for a while and you can confidently anticipate revaluations based on BOTH fundamentals and trading history. So the optimal approach is, stick a small amount in now as insurance, then trade it confidently once it's launched.
That way you won't miss any boats and you also won't loose your shirt.
However much it is, it sounds like he has put all his eggs in one basket, which is a big gamble to take.