Hi.

Hi...you can purchase QFF points....can you purchase virgin velocity points?

Yes you can, but only can be purchased from the FF call centre.  The cost is between $20 and $557.50.

How Top-up points works

• Points may be purchased in blocks of 500.
• Minimum 500 to maximum 20,000 points per purchase.
• Points may only be purchased with a specific Award in mind.
• Members may not purchase more than 15% of the points needed for the Award.
• Points must be purchased by the member on their own behalf.
• Each member may only purchase points once every 12 months.

Purchase Top-up Points

To purchase Top-up points, contact the Frequent Flyer Service Centre.

No, unfortunately you can't. As per the FAQ section of the virgin australia website. 

No, you cannot.

What do you want to to use points for? Perhaps we can find you an alternative program where you can buy points.

Sorry did not read the full question. My comments relate to QF.