There are quite a few different ways, you just have to think outside of the box
First off, limited wish can duplicate effects such as revivify. Which means that if you act quickly enough it can happen rapidly and for much less cost. given the extra cost some dm's may even be persuaded to extend the amount of time in which you can do this (which would make sense, given the potential extra cost and duplicating of a higher level effect)
Secondly, one may not have access to 8th level spells (this is the one I previously mentioned). You may not be able to find a spellcaster strong enough, if you can they might not have the spell, if they do they may not be willing to do it for you, even after all that they might just charge much more than what the dmg normally says.
Thirdly, eh, I am sure you and others can think up other situations where the overal 'cost' is less. It just depends on what you have to go through. The above are going by the general guidelines of the game (the game I am in currently limited wish would be infinately easier than clone, for campaign specific reasons).
Easy enough. There are different ways of getting the same result. Sometimes one is better than the other, depending on the situation.