Thank you for your comments. However, Migadu is not intended to be "cheap". That is not the selling point of it.
We used to use Google Apps for multiple domains for our starup projects, ideas etc. Switching between these multiple accounts was becoming ridiculous and complex. Then, they made it $5 per account. We actually had many addresses but only two users. Our total cost of that would be measured in hundreds of $ which def would not be worth it.
What I personally dislike regarding other services is that they claim storage as one of the most important selling points but then do not account for the price drop per GB. Since GMail for work launched (2006?), the cost per GB dropped more than sixty fold: http://www.mkomo.com/cost-per-gigabyte-update
Any update in price? Nope.
And then, the price of Google Apps (Gmail) are global. We have clients in Zimbabwe for instance. $5 per month per account is not the same as it would be in the US. Yet if a company from Zimbabwe uses a @gmail address, it won't be taken serious.
Migadu is profitable since a while ago, and real money is relative. We're not after exits and TechCrunch, just doing what we like and hacking at it daily. :) Pays the bills. Ironically, we are also in Switzerland, where living expenses are among the highest in the world.
Thanks for the assertions though! :)