It doesnt mess up your boots at all. Just take the liners out and let them dry for a couple days. You can also use a hairdryer to dry out the insides faster.
if you use them a lot ramping it deffs fucks them up. it packs out your liner a lot faster than usual. ive seen people use the same boots they ski in but they have extra liners for whenever they ski with them
best solution: find a cheap pair of liners. like go to goodwill and look at boots and get a boot that is around the same size. then use the liners from them in your boots