It doesn't say they stopped doing the workshops for 7 years, it says:

Holding workshops there has been a logistical challenge, because those events mean that the people at Coudal Partners can't work at their own office for a day. That doesn't scale well. We'd like to be able to do a workshop every six weeks.

So it doesn't sound like they stopped at all to me, just that they couldn't hold as many as they wanted.

We held a variety of workshops over the last 7 years, but we had to rent out a separate space each time. Renting out a space was expensive, more complicated than we'd like, and just a general hassle. Having our own space does away with all those negatives.

thats not their primary business. they are bringing in 8 figures a year in subscription revenue from their SaaS products. why would they devote a huge chunk of their time to a 5 figure line of business. now with the bosses less integral to the day to day programming work, they can focus more time and effort on teaching, which they seem to enjoy.

I'd be willing to bet the teaching, workshops etc are the funnel into which flow people, who leave thinking "wow they're cool. I better signup to a basecamp account".

Without the teaching, book, blog, workshops etc, who would buy basecamp/campfire?

basecamp came before their initial workshops. they taught by blogging alot. workshops/teaching only bring in a small number of people at a time. But they do usually result in high LTV of each of those customers.