Yep.. the BIG opportunity seems to presume better places to put money than bitcoin and/or to use bitcoin profits for such purposes, rather than perhaps getting the money for "Big Opportunities" from other places.
Of course, when guys are young, they are likely going to come across opportunities and also sometimes need capital to get into certain kinds of deals/arrangements... but that still might not mean it would be a good idea to use bitcoin proceeds for these kinds of matters, yet at the same time, everyone is going to have to make these kinds of choices for themselves in terms of both balancing their finances and balancing where they have allocated their investments, whether it is time, energies and/or monetary value.
IMO I don't think that investing in bitcoin should/would stop anyone from taking advantage of other opportunities that involve money, if you are following the plan of investing with your disposable income(money you won't miss) then it shouldn't be a problem for you cause this would be only a small percentage of your income and yeah if some sudden even occurs and you need immediate cash then you have your reserves to save you and I feel that its also good we have other savings apart from our bitcoin investment, so this can be used for other stuffs too.