Look up the word contango. You're constant buying more expensive futures contract to replace expiring futures contracts that have declined in value over the previous month. Therefore, if the price of oil stays the same, you are guaranteed to lose money. The only way these ETN's make sense is if you buy one day and correctly time a big spike the next day.
This is not good news. The President and COO sold 1/3 of his position after last week's quarterly report. Yahoo will not let me post the link, but you can find it by going to the VDSI page on nasdaq.com, and click on "SEC filings" in the left column. When you're on the SEC filings page, it's the 2nd one listed (form type 4).
...and begging for an intelligent, non-sarcastic answer:
Why does the company seem to have difficulty cracking the US market? Is it because the US still uses the old magnetic strip credit cards while the rest of the world is moving to chip on a card? If so, once the US finally moves to chip on a card, it should be a bonanza for VDSI.