There are some certain needs that shouldn't be cut off on somebody's life because of how Important it is and in terms of going out to get some things such as wristwatch or taking the family out for some fun shouldn't be seen as mismanagement of money or leaving a luxurious life because those things are normal and very important for families, so I'm of the opinion that instead of you to be investing $100 weekly while you deprive your family from some important basic needs you can actually cut your weekly accumulation amounts abit, let's say instead of $100 weekly you can bring it down to either $40 or $50 on a weekly and you will see that by cutting it will not prevent you from the amount you wish to achieve in the future.
Everyone here is taking my examples as the only scenarios to save money, while my point was just to give idea about how to save money. If you are going out very often for dinning then you might consider cutting one or two dine out to save money for Bitcoin or you may opt for non-branded pants if they are good in quality. These are few scenarios for people who are struggling to save money for Bitcoin and they are not the only one, everyone has different spending patterns and can plan cuttings accordingly. If there is no scenario for saving money then one can proceed with his normal life till the time he has something to invest.
This is also great idea to invest less during the time you have less cash and can go bullish when you have extra cash to accumulate good quantity of Bitcoins.