Leather Seats

In the feature on the planned refurbishment of 444 & 450 units, it says that leather seats are going to be installed in first class accomodation. 

For most travellers, it won't matter, but vegetarians and vegans (maybe 10 to 12% of the population) won't want to use them. 

Is there a good economic reason such as they are cheaper to clean or have a lower whole life costs, or is it the "image" that matters....