I think I pretty much explained why and what 'sacrifice' during the season of Lent is supposed to be...that some don't 'get it' is true, but be careful not to generalize based on the 'religious persons' that you know. You don't sound like you have a great understanding of this to begin with, so I would assume that you are surrounded by like-minded people. That some simply go thru the motions should not be an indictment of "Lent" itself.An individual can use this time, but it's not that way. It's become an empty tradition amongst many (and I'd venture to say most) religious persons. There's much more to Lent than just giving up some trivial object.
Nor, should it be a contrary judgement of those who you say are following "empty tradition".We are all at different places on our spiritual journey.