1. Starting today on April 10, 2021 if I invested 150k in bitcoin, how much do the gurus expect me to have in 1, 2, 5, and 10 years? Like would any idiot who just invested today and didn't sell expect a 5x increase within the next 10 years?
Can't exactly tell since crypto is still unpredictable so there are a lot of things that could happen within those 10 years. However, if Bitcoin would perform well within that timeframe then I could say that it is more than enough. 5x increase is possible in fact it could be even more than that.
2. I would use dollar cost averaging, but over what time horizon? Invest 150k over the next six months? Or just invest it all today since we all know it's going up?
Doesn't matter that much since you will hold it out for too long but it is recommended if you will buy at a cheap price to maximize your profit. Watch the market if there will be any dips and then that is the perfect time to buy.
3. I could withdraw the old retirement fund and get the initial investment up to 300k. Would you go all in using that? I would not have much of a backup plan for retirement if this is the case, but like I said I have a high risk profile. I do believe this is once in a lifetime.
If you can afford to lose all of them then no one will stop you however, you must face the consequences because crypto is still risky after all even if you investing in Bitcoin. Personally, I would not get that far so I wouldn't recommend it for you to place it all.
4. If I want to pursue some alt coins, and again, I have a high risk profile, what % mix would you recommend? 33% alt-coins and 66% bitcoin, or 50-50, etc?
Yeah sounds good since you have a huge capital diversifying it would be a good option to mitigate the risk, however, you must consider the altcoins you are going to choose, as much as possible get those coins top listed ones. I think the 60:40 or 70:30 ratio will be enough and the large portion must be in Bitcoin of course.