You trust one of those absurd "password keepers" and think that making a risk assessment on low-danger websites where no harm could come even if someone did by remote chance try to break into your account is stupid?
If you are one of the password zealots, using one of those "hey stuff all your passwords into one convenient app!" programs is simply the dumbest thing you can do. It's akin to taking every object you own with any value, including all your cash, important papers, SS card, etc. out of your safe or safety deposit and just leaving them in a cardboard box, putting it in one storage shed outside your home, and "securing" it with an off-brand padlock on it you got 2 for 1 at the dollar store. If someone does break into it, by breaking just one lock, you've just given them everything you own of any value.
Now THAT is stupid.
Particularly the phone app based ones - most of which backup to "the cloud" - please, seriously. They are all written by unknown companies that I'm sorry, I'm not willing to trust the most essential data I have to, much less allow them to back up. But even if you disable that (then when you drop your phone and it busts you are fucked), or use a desktop version (lot of good that does on the go), they still make no sense whatsoever. Even if it's a "known" brand - still absolutely frigging retarded. It's amazing how many folks see the promise of encryption and think it's safe - unless you are decompiling the source code, you have no idea you can even trust that. But even if it is truly encrypted - have you never heard of the very time-tested wisdom against putting all your eggs in one basket?
It makes perfect sense to reuse the same password, or very close, for stupid sites where there really is little risk to begin with. Every fucking thing you do on the Internet requires a login these days - "Oh noes! Someone hacked into my Pollstar.com account, that doesn't even have my real name attached, and signed me up for concert date notifications for Taylor Swift to my dummy email account!"
You need your strongest password for your email (which is the key to many site password resets), and hopefully you are smart enough to have multiple throw-away email addresses for low-priority stuff (which you can conveniently forward, or, as I do, just have multiple accounts on your phone or tablet device). Next you need to have decently strong passwords for your financial sites, depending on what they are. But beyond that - even for things like your cable company - not much someone can do, even if they break into it, that can't be undone, aside from pay my bill for me (and if anyone wants to do that, shoot me a message, I'll send you the damn password). My payment info is saved, but it's ********** out, someone can't glean the number from logging in as you. Someone can play a trick and upgrade your service I guess? I'm sure the world's foremost hackers are right on that one.
Like everything, there is a middle ground. You just need to make a reasonable risk assessment by site. I basically have three tiers - one, strongest for email/financial, two, semi-reused for things like paying my cable bill or light subscription maintenance, etc., and three, reused for stupid sites that shouldn't require a login anyway, or where the data is completely inconsequential (the aforementioned Pollstar, etc).
But I sure as fuck am not going to put ALL of them into ANY app or single program - there are backdoors built into routers these days, you expect some start-up (or even established) "password keeper" doesn't have that possibility? I am concerned for your common sense.