My verrrrrry expensive Swiss Cheese plant

 Last weekend at the car boot sale I sold half  a dozen of my Swiss Cheese plants for £6 each.  One of the ones on my table had mottled markings all over it and a young lady asked if it was a variegated one.  I'm afraid not said I. It's just a little bit pale from lack of light in the bathroom.  The young lady didn't buy the plant and the poor thing sat there unloved and unwanted... I brought it home with me but guess what???? It is  indeed a variegated one and the markings are becoming more and more visible.  I could have sold it last week and been none the wiser but now have a potentially very valuable plant which I shall be caring for like a baby.  And I'm looking at another one which is showing signs of mottling so I may well have not one but two valuable plants.  I plan on keeping them though and using them to take more stock off in a year or two if the markings are really pretty.