Hi Bernie. My experience precisely.
When I first started Newport, I began by reviewing prices daily, then bi-weekly, weekly, bi-monthly, and now monthly. I used to be so caught up in watching the tape, and I even updated Newport daily at first, using the "Fix a Price" feature in the maintenance menu. Talk about anal!!
I typically update on a monthly basis now. The only time I alter that behavior is when there is a super dramatic drop in the markets, which presents a great buying opportunity. If Newport already had me scheduled to buy, then I might buy before a month passes. I did that after 9/11. This, of course, adds the element of subjectivity into an otherwise unemotionally structured AIM program. Still, it works for me.
In general, I have found what you have found. I miss a few buying opportunities, but some of my trades are placed at much better prices. It's probably a wash, and might even favor less frequent trading.
In spite of a prolonged bear market, I still have a reasonable cash reserve, while I suspect many weekly (or more frequent) traders do not. Monthly trading slows down cash burn considerably.
Lou