Maybe Streeter has margin loans and is concerned about the...

Maybe Streeter has margin loans and is concerned about the possiblity of margin calls leading to a forced sale of his entire holding in the current market uncertainty. He may consider it better to sell a small proportion of his holding at $2.50+ rather than risk being forced to sell the lot if the price takes a dive down below $1.

Note this is pure unadulterated speculation - I have no idea if he has margin loans.

On the other hand maybe he's bought himself a new house on the Swan River as a Christmas present and needs the money for settlement.

Given we have no idea of the personal financial circumstances of directors I don't usually read much into one director selling. If there are several directors selling fairly decent volumes (as nearly all the ROC directors were last year when its share price was around the $3 mark) then I will look seriously at whether its time to get out.