Hi. I guess you will not be always there to explain, when poeple are wondering what "ARB" means? Serious, that's the problem. A certain circle of experts or insiders might know what "ARB" means. Sure, those people could be potential endusers and buyers. But then is the question, how good the chances are that anyone of this circle is searching for the name. Anyway, if you don't know this particular market, I guess you have to spend much time and work on investigations. Well, I don't think that the name is it worth. In my opinion low $$.
You are welcome. Well, in general I don't think that the name will have any future value. It's simply not of the kind like "mydiary" or "mycookbook".
And even when one would say there is perhaps a slight chance that it can be used as a synonym, perhaps as name for a medical drug, that would be more a hope than a real chance.
Anyway, wonders and surprises can always happen. But as for me, I wouldn't wait for one. If I don't need the money, I would keep the name, just in case. Otherwise I would sell it without feeling bad.