It's all that intricate pokerwork....

Don't be a philistine Skipy, the tomb is 700 years old, and we have a duty to hand it on intact for future generations. Proper conservation work is slow and difficult, as you have to be sure that the treatment won't cause damage. The overall cost is half the price of a modest house, or about the same as a bus, or lunch and a round of drinks for a CBI meeting.