Good question :-) Currently we are using some of it to subsidise training sessions e.g. swimming where there is a cost associated with it,
In addition, occasional events such as bike maintenance are held and these typically require a room to be rented.
In short though - the club funds are spent on its members. At the annual AGM in Oct/Nov details of all club finances are published.
Note that 3D membership does not include membership of Triathlon Ireland - that's separate.