Store Up Treasures in Heaven

“Do not store up for yourselves treasures on earth, where moth and rust consume and where thieves break in and steal; but store up for yourselves treasures in heaven, where neither moth nor rust consumes and where thieves do not break in and steal. For where your treasure is, there your heart will be also.
“No one can serve two masters; for a slave will either hate the one and love the other, or be devoted to the one and despise the other. You cannot serve God and wealth."

Jesus of Nazareth (from Matthew 6)

Two weeks ago we looked at Matthew 6:25-30, where Jesus calls us not to worry. That text begins with "Therefore...." Today's reading is what the "therefore" is there for.
Not worrying is connected to Jesus' claim that we cannot serve both God and wealth. If we store up treasures on earth, our heart (our moral and affective being) will be tied up with them. We'll be thinking about our treasure, regularly checking our stock portfolio, and buying ever better security systems and insurance. I was on a clergy retreat in 2008 when the stock market crashed, and was dismayed to discover the number of clergy present who were far more worried about their own sudden change in wealth than they were about how to care for their churches.
What does it mean to "store up treasures in heaven?" Luke's version makes it clear enough: give to the poor. Instead of investing our extra funds in savings "for a rainy day," Jesus calls us to invest in people, people who are having their own rainy day right now.
Jesus primarily spoke with poor people in a poor country. In a rich country, money can flow through our hands quickly, and the right investment in others is not always readily apparent; perhaps having some money saved temporarily for the right use is reasonable. How much is too much? We'll consider that question throughout the week. For today, let's look at some simple facts about my treasure:
Full-time United Methodist clergy participate in a mandatory pension plan. Conference leaders recommend that we contribute additional funds to this plan in order to have enough at retirement. I've chosen not to, and indeed the General Board of Pensions website states that I am not on track financially to retire at 65. Here's what they say about my supposedly insufficient retirement package:

• My projected retirement income (in current dollars) is about $36,000, not up to the recommended "85% of expected final year income."
  $36,000 places my household of 2 among the richest 7% world-wide.
• My current portfolio is worth about $135,000. That's considered a bit low.
  A person earning the global median income would have to save 100% of their income for over 95 years in order to save up this much treasure.

As a United Methodist clergyperson, I am encouraged to store up more than this for myself on earth by our denomination.

What do you think?
Is there a way to interpret "Do not store up for yourselves treasures on earth" that makes it OK for me to save up one hundred times the median annual income?

Do you see teachings of Jesus that encourage us to save up wealth? How about elsewhere in the New Testament?