I've had boots that I've loved for three years, so they're still virtually new. I've only skied about 25-30 days on them.
I've read many times that liners eventually pack out and that at that time people realize their boots are too big.
But I've experienced the opposite. After having comfortably snug boots for three years, the liners packed out and the boots became TOO SMALL.
So I went to an awesome bootfitter, who showed me that the footbeds that came with the boots, the footbeds that are in the liners, were worn out very bad. They were flattened, which caused my heels to come out of the back and push the feet forward. This is why my toes were getting crushed.
So he's fitting me now for new footbeds. Yay!
So, keep in mind. The footbeds that come with new boots are cheap and don't last long. When they wear out, your feet will push forward into the boot, crushing your toes.
So buy new footbeds, just so you're prepared. I hit the slopes one day and my boots all of a sudden didn't fit, were too small. My ski day was ruined.
Things are good now.