Hi Ray, A couple of issues around ETFs/ETNs/ETPs are that they often have less volatility and a smaller high to low range over time than single stocks/bonds. The problems with AIM and these positions is that the original formulation of AIM was before these products existed and so the parameters used for stocks/bonds don't fit all that well.
For example, if you use standard settings of 10% buy/sell and 10% stock value you will find that the next buy/sell will be beyond the 52/104 week high/low range. Then, in order to keep your trading costs to the minimum, you have to have a larger position size if you reduce any of the three settings. (BTW TradeStation has a commission of a penny a share with a minimum of $1 which helps a lot compared to the $8-10 range of others.)
Also, since the volatility tends to be low, then you have even less activity than a standard AIM position has. This is great if you don't have a lot of time to devote but it slows the process of beating the returns of the indexes.
Hope this helps,
Allen
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