And here's the longer reply to my above comment:
Let's see, 1+ years in, an almost 6 and almost 4 year old. Could my car be in better shape? Sure. But I'd rather let me kids enjoy it too. Some things that might bother you that kids cause to the car:
-The booster seat makes an indent on the sides of the back row, as it's obviously too wide. But I'd rather chose a safer [and wider in the case] booster seat, than one that would fit and be less safe
-The booster seat leaves an indent in the headrest
-Got rigid seat belt extenders to make life easier, very short ones do keep the geometry of the seat belt pretty much the same as if there was no extender.
-They touch the outside of the car with their whole palm for whatever reason, and they leave oily residue on the car, very visible on a freshly washed car
-I typically don't want them eating in the car, though I do allow it. It's not a "rule", but we stop on road trips often enough that there is no "need" to eat in the car. This leads to crumbs in places you can't imagine.
-RFS are a hit with their friends, they don't like them so much. But they (both my kids and their friends) like to put their feet up by the glass, and that leaves scuff marks on the trim under the glass.
-I'm 6'1", and I like my seat almost all the way back, so my seatback gets kicked occasionally. It gets so dirty/scuffed it's hard to wash it out.
-The use the little pocket next to the door handle as their place to store toys. But considering how small it is, most of the toys are on the floor/in the empty seat between them. Sometimes it looks like a war zone back there.
-My son accidentally whacked my car with a while back, he didn't leave a mark. But we had a talk about how it's not good to swing sticks around because he might hurt himself or someone else.
-My son drew with ink on the leather about a month ago. Rubbing alcohol got most of out it, it's still visible though. I have no idea how, but he had a pen in his lunch box, I'm guessing he stole it from preschool.
If I obsessed over each of these things, I'd lose my mind. It's a car, use it. By the time my kids outgrow their carseats/boosters/etc. the leather will be so indented, i don't think it'll recover. By the time I'm going to sell the car, a few scuff marks and leather indents aren't going to make a huge difference in cost.