How accurate is the 'equivalent to' buy it now price?

[davebowman]

When you go to buy a scene, there is a button next to the 'buy it now' box which states how much the scene is equivalent to in real money. Are my maths wrong, or is this figure off?
Even when buying tickets at the lowest possible price (which I presume is the 3 month membership option), this number seems too low, making the scenes look cheaper than they actually are.
Or is my maths shit and am I just completely miscalculating these things?

[xxx]

It is supposed to be 100% correct (unlike Woodman), based on the real money you spent for your tickets. It is based on your data only.