What well-known and perfectly adequate open source competition did your compiler have in the 70's and 80's?

We're talking about a mail client here. A $120 mail client whose website mentions not a single advantage over the leading open source solution in its market.

I assume you are talking about Thunderbird? I used it professionally for two years before deciding it was much, much worse than the alternative (Outlook webmail + a gross CLI tool for other misc email). It's slow, it uses a lot of disk space for bad reasons and just generally operating on a lot of email is a massive pain.

Compared to that, I'd have difficulty believing there are many email clients out there that are actually worse. Even emacs as an email client was better (and it still wasn't great as you can imagine).

A few, for those willing to type them in from university, magazines and hobby club listings.

I guess sendmail and p̵i̵n̵e̵̵ mutt are good enough™.

We tried a few price points/models. This one is what seems to work for us. Every business is different and it's a matter of experimenting until you find what works.

Perfectly, that is the point I was kind of trying to make.

It is easier to ask for a random price, without taking the time to understand that there are a set of variables associated with production cost and keeping it sustainable.

All the best to your business.