V-Flyer

I was under the impression that Virgin had a sale on until the 6th of June imagine my surprise whilst monitoring ticket prices with a view to booking seats for flights next, bang what appears to be 30 - 50% increase in the price of flights to LV. Does anyone have any idea why and are they likely to fall again in the coming weeks.

The number of sale seats available on each flight is limited, maybe all have been taken

Need to know the route and dates and can do a load check.

I didn't know there was even a sale on! I can't see anything on the VS site - is it very well hidden???