one could hold 150 different stocks, execute over 7200 trades in those stocks (4000 of them), have 120 free market trades (10 free a month) in stocks outside of their window stocks, and make additional trades at only $4 each.
True. However, in practice I usually don't make more than 60-80 trades per month (but then I don't have the full-blown 150 stocks/funds either (at least not yet!)). If you're comparison shopping, you need to determine the breakeven point. For example, if Foliofn's costing you say $29.99 per month (not sure of actual going rate so bear with me) and you can get Scottrade's at $7 each, for example, after the 4th trade Foliofn becomes more and more economical. Now AIM may reduce the number of trades you're making, especially if you're AIMing a whole folio rather than the individual components in that folio, so you'd still need to see if this cost structure works for you - but I'd think in most cases that it will.
AIMster