No brainer for me.
We need back rowers, Olbison is a back rower. I know he's not a world beater - but show me a list of other back rowers who are available and could be acquired within our current financial limitation...
The fact that he was evidently considering going part-time and getting a 'proper' job indicates that the offer from us was modest - presumably far less than his previous contract. So for a modest outlay we are getting someone who can operate effectively at this level, loves the clubs, wants to be here etc.