This is where the purpose/mission of the organization is important - or as I said before, where it is important to consider what kind of museum we are talking about.
If you go to
www.mstrp.com, you will find a link to "our collection". Clearly, the Steam Railroad Institute is a museum similar to CRRM ... they value their collection of artifacts for its diversity and significance, their expenses are probably modest, and they are within easy driving distance of significant populations (Flint, Lansing, Ann Arbor, and Detroit metropolitan area).
If you go to
www.cumbrestoltec.com, you will find a link to "equipment". CATS is a working railroad ... they value their equipment partly because of the service it provides, their expenses are significant, and they need to draw riders from considerable distance (which means that they need a constant and consistent marketing effort).
Thus, comparing these two is like comparing apples and oranges.
BTW - I assume that you made a suitable payment to SRI to underwrite the cost of repainting the locomotive.