A load of 28 pax on an 82 seater = 34% load factor, which is obviously rather low.
A 40-50 seater could have carried this kind of load as well, possibly at a lower cost.
Let's hope for SN
that these 28 have indeed paid a reasonable fare. My best guess would be that all these 28 pax have paid an average fare of 180-200 EUR for that particular segment => this flight may have generated 5040-5600 EUR total revenue. I'm not familiar with the operating costs of an RJ85, however I would guess that this kind of revenue would not be sufficient to cover the costs of a 1,5 hour flight with an AVRO.
I suppose that the affected flight was SN2274 GOT
I would think that this is quite a good schedule for a Friday evening and also I would expect that a Friday evening should attract stronger traffic than -let's say- a Monday or Tuesday evening.
I would also expect that the outbound SN2273 BRU
14:35-1620 in general does not generate too much revenue either...
Hopefully the real revenue picture is more pretty, however I would also have responded like ...