Don, I have long considered that interest rates could only go up. To that end I started a LD-AIM type program in Jan 04 in RRPSX. I pretended a $20,000 account. 1% Buy Safe 3% Sell Safe $1000 min Initial purchase 1/5/04 420.7 sh at 23.77 purchase 3/10/04 46.9 sh at 21.30 purchase 9/28/04 47.9 sh at 20.87 (I think I cheated some but did buy the $1000 min exchange which Profunds requires)
Currently it is showing a price of 21.29 which gives me a theoretical buy of $273 which of course is below the minimum.
Just to be complete, I also have a US Bond Trading System which has performed fairly well, but requires more margin than I am willing to put up. Using that system one should be currently short bonds and 10-yr notes. I am implementing this in the RRPSX fund.
RRPSX is the managed account version of RRPIX. I once had managed accounts. That guy went out of business but they let me exchange the same old funds.