I have noticed that with canned beans, but for me that is OK, since i value the cooking juice as much as the beans. I guess it mostly depends upon how you use 6hem..
At present, as I see it, canned beans are one of our most thrifty food values out there, high protein for a low price.
Right now, I can buy the Campbell's standard soup can size pork & beans (pork must be invisible) for $1.09. Off brands can come for less..
I don't stick with Campbell's alone; I will often pick up Bush's or Clarks (Canada), and there is a company (forgot name) in Minnesota, which does a great job on various beans, involving bacon, etc., which I get at Walmart.
Apparently not your "cup of tea", but I like the juices they are cooked in !