The question of whether you interpret Whytham Abbey as a sign of lavish spending and motivated reasoning or as a a very reasonable investment largely depends on your view of EA and whether you trust EA/CEA/EVF
The question of whether you interpret Bob's habit of wiping his ass with donation money as a sign of lavish spending and motivated reasoning or as a a very reasonable investment largely depends on your view of Bob and whether you trust Bob.
Those who do not trust Bob will say he could use toilet paper or at least smaller denominations. People who do trust Bob will point out that keeping guests comfortable is very important to Bob, that toilet paper doesn't have the right softness and that Bob can save more lives if he doesn't have to worry about hemorrhoids.
While there may be no obvious, evidence based conclusion to reach, I think we can all agree that Bob should have managed perception of his ass wiping money more thoughtfully.