Normally I'd like to try to understand what you have against AGPL (Opa is dual licence btw.) but given that half of your wording is around words like "retarded" and "stupid", I'm not sure whether you're really interested in real discussion?
From previous experience with AGPL licensed libraries and tools, I decided that it's best to avoid them without exception.
Basically, GPL and LGPL are the only acceptable licenses from the *GPL family of licenses when building websites. (GPL/LGPL/MIT/BSD for the server side software, LGPL/MIT/BSD for the JS libraries reaching the browsers)
I don't like the idea of being forced to license the app under the same license and release it to the public under AGPL if it's web based or running on the network.
I've come across such a company which demanded about 300 USD for a javascript library. Of course, we were told of this generous pricing via email. We rolled our own. That's when I started to hate AGPL with a passion and to dislike companies which use it.
Therefore, you can say that I don't want AGPL anywhere near any of the websites I'll work on or I'm currently working on and that I doubt that the companies which use this license have a good business model.
Opa has got weird looking syntax which can only lead to even nastier code. It also has HTML mixed with that weird looking syntax. The database is also something proprietary and weird. Normally, I can easily read code in a language I'm not used to. However, this was particularly bad.
All of those apps they show on the website are toy examples. Nothing big or popular was built with it. This makes me believe it's extremely difficult to get something done in this language and with the tools of opa.
Do you need to fix an issue? Perhaps add a new feature? I am ok with giving back changes. Since it's all written in (o)caml, it's more difficult to do that.
As for the part regarding the money they received, the people who gave them that amount of money are having a problem noticing how bad this opa language is. To me, it looks like they wanted to "gamble at this table" as well, just in case it turned out to be something more than a flop.
The things I'd give another chance somewhere else are: keeping the database & everything else in a single binary and some of its distributed architecture.
P.S.: I prefer to donate money to open source projects, rather than buy software to be used in the code of the sites / apps I work on.