Treasure

To my mind, "laying up treasure in the kingdom of heaven" is synonymous with the practice of
Self-development.
You know how they say "You can't take it with you"? Well, I am very sure you can take it with you if you've made it part of who you are.
If for instance you are, oh say, abducted by aliens (:-D) or kidnapped by terrorists(;-o) or someone puts a weird drug in your drink or if you actually find yourself dead and in another world , your bank account or fancy car aren't going to do you much good.
But the spiritual and mental resources you have made a part of your being by study and practice will go with you anywhere. And I believe the best area for study is your own Self. The kingdom of heaven is within.
I use examples from Jesus' teachings because they are familiar in our culture. Not because I am affiliated with any religion. (:-c)
I guess what I am saying is a person needs to pay attention to their own self and not to the outside world.