I'm a night vision junkie through and through, so I've got no vested interest in discouraging anyone from purchasing NV, and I kick myself all the time for not getting personally owned night vision sooner.
That being said, if you don't have a specific use in mind, what I often find that it comes down to for people contemplating the purchase of night vision is whether or not you realistically have a place and the time to shoot with your NV. On the one hand, I'm a proponent of "where there's a will there's a way," but there's no question that certain people's situations allow them to get a lot more out of NV than others.
If you have land, or know of land where you can pop over and shoot at night, then NV will be a great asset--it will effectively double the amount of time you can spend shooting, and it's a lot more fun (IMHO) to boot. Certainly if you've got places to coyote or hog hunt, then you can probably go out and shoot at night as well.
The other side of the coin, though, is if you live, say, in a suburban area, don't really know anyone and/or have a place where you can go shoot at night, and are essentially going to be stuck walking around your 1/4 acre backyard and around your house, or worse yet, your apartment complex, where not only will you get weird looks--but you're also advertising to everyone "hey, I've got expensive toys to steal!" This is all assuming you can find somewhere in your neighborhood where there isn't too much ambient lighting in the first place to even be able to use your NV.
Another side of this coin is going to be the time issue--say you have a place to go shoot, but what's your work schedule? Are you a day person or a night person? What about social and personal obligations? Are you going to be too beat after work to go and set up to shoot after dark? Are your partner or kids going to be okay with you slipping away and spending Saturday night shooting instead of taking them on a date or doing something as a family?
Again--these are all not insurmountable problems, but they do require slightly different coordination than "conventional" shooting during the daytime, when most people "expect" you to do such things.
To be fair, there are most certainly other things that you can do with NV besides shooting--if you like astronomy, camping, hiking, etc., NV can be a lot of fun for those activities as well, but this is a shooting forum for the most part--people may have other interests as well, but they've chosen to spend a significant amount of time on a social media venue aimed (pardon the pun) at firearms and firearms related activities, and you're talking about sacrificing some high end firearms in favor of getting NV. To this end, many of the people whom I've met and spoken to who do not have readily available land that they can shoot on, and/or a schedule that allows for it often find their NV purchases to be something of a disappointment. It ends up being a cool toy that they can tell everyone they have, and they can take their friends out in the backyard and say "check this out!" but they largely end up being expensive devices that almost never get used, except under very limited circumstances, e.g., an organized night shoot, paid hunt, or class.
Personally, I'm all for everyone being able to own, buy, and use whatever the hell they want--but read the "NODs for HD" thread below, unless you have a serious fear of the breakdown of civilization in which you feel that it's worthwhile for you to spend $3,000+ on a tool you will probably never use during the apocalypse or societal breakdown and anarchy, it's not really a "critical" item to have for "HD/SD" for most people--unless of course you have a large, rural property to defend... in which case you probably have the space to shoot on as well.
Again, none of this should be taken as any indication that anyone needs to justify any purchase if that's what they want, this is simply feedback based on my experiences with people who want to begin dabbling in NV, and aren't sure whether or not it's going to be worth it for them.
~Augee