I have certainly found the same results as Ken, the more frequency, the faster the list gets built.
It doesn't have to be a daily sales pitch, and that's not what Ken is talking about - it's putting your brain to work on thinking like a true online publisher where your job is to offer something of value to your market each and every day.
It could be a tip based on personal experience, results of a test you ran, a testimonial from a subscriber or customer, emotional or motivational support, a product or service review, comment on a news story, etc...
Really, the options are endless.
In each case, it's easy to tie your information back to a high-value opt-in campaign and your products or services without always blatantly advertising.
Also, if you really want to create a list fast, declare all out "information war!"
Here's what I mean.
In the last month I've added 3,000 new people to my list in one niche and hundreds more in other niches by doing the following:
1. Posting to a related blog at least 4-7 days in the week.
2. Write at least 2 articles per week on each niche and submit them to article directories (and direct to publishers will work even better)
3. If you operate an affiliate program - re-energize your affiliates by offering them a bump in commissions and some new tools
4. Write a report a month - 10-15 page reports can serve to offer a good bump in your opt-in's as well as a great viral tool for affiliates (enhanced even more when you allow them to re-brand with their affiliate URL)
5. Create a 2-3 times weekly autoresponder PRE-LOADED with at least 6-months of tips and emails. While this takes some time up-front, after you're done, you have an automatic money machine and can move on to other marketing activities. This is one of those hard-work items that Ken and other millionaire marketers put into action, but very few others will ever do.
6. Once you have all of this in place, you can look at alternative advertising routes such as PPC, offline magazine articles, etc...
It's simple, if you are willing to put in the consistent, persistent effort over a few months, your steam-engine will pick up speed, then it becomes an exercise in how to build a giant business rather than simply one that will make you a living -- but that's another post