Sorry, I'm only referring to new money: every 2 weeks I put $1000 into my brokerage account to buy whatever long term stocks/funds on my watchlist look good that week.
Lately that's been nothing but Target, but it might switch to nothing but Amazon next month, or 50% AMZN 50% something else, and so on. So it's just the new money coming into the account getting divvied up, but doesn't reflect the actual holdings of long term account as a whole (which might only be 20% TGT and 80% other stuff)
$2,000 is better but even that's rough. Consider you have $7 commission. With each $1,000 purchase, you have to earn 0.70% just to earn back that $7. If you sell that $1,000 purchase, it'll cost another 0.70%, totaling 1.4% in fees.
Based on your strategy you're probably incrementally purchasing and the selling in bulk so the sell commission isn't as damaging but losing 0.70% of an investment right off the bat makes it hard to be profitable. Even half that amount, if you increase your lots to $2,000, is painful.
Lately that's been nothing but Target, but it might switch to nothing but Amazon next month, or 50% AMZN 50% something else, and so on. So it's just the new money coming into the account getting divvied up, but doesn't reflect the actual holdings of long term account as a whole (which might only be 20% TGT and 80% other stuff)