This should be the SCSI-Modul you are talking about.
http://www.amiga-hardware.com/showhardware.cgi?HARDID=1142I personally only had A2000 and A4000 Apollocards and there the scsi-part is soldered directly to the board. Judjeing from the description this SCSI-module is as crappy as all Apollo SCSI-thingies, as there is no SCSI-Chip on the board only some gluelogic that mimics a SCSI-bus and let the CPU handle all the load (so cutting away nearly ALL advantages of SCSI) plus the SCSI controllers from Apollo are the most incompatible I have come across, basically If you don`t have the drives that are listed in the manual you are out of luck.
As for selling it: Well, you shouldn`t expect much more then the shipping fee for it, lets say 15-20 EUR or so (while a Blizzard SCSI-Module goes for 50-70 EUR).
Maybe you get more from a collector, as I haven`t seen much of those around (for obvious reasons, it was allready well known that Apollo controllers suck when they were new back then).