While the following share prices quoted are for UK shares, I think the facts would apply whatever country you are in!
If you had purchased £1,000 of Northern Rock shares one year ago it would now be worth £4.95. With HBOS, earlier this week your £1,000 would have been worth £16.50. £1,000 invested in XL Leisure would now be worth less than £5. However, if you bought £1,000 worth of canned beer one year ago, yup, that’s a lot of beer, drank it all, and today took the empty cans to an aluminium recycling plant, you would, at present day prices, get around £200. So based on the above statistics the best current investment advice is to drink heavily and recycle. OK so you would not have made a profit, given yourself a headache perhaps but you may not care so much about any loss.
Now what did He say about on this subject... oh yes... I remember... "keep on storing up treasures for yourselves in heaven, where moths and rust do not destroy and where thieves do not break in and steal". (Matt 6:20)
Regarding the latter part of His comment, whatever did happen to all that money that has been ‘lost’, did it ever exist or is it still somewhere?