If they are for rails/urban you will be fine. Remounting does weaken the skis core. It is said a ski can take up to 3 mounts before being completely unridable. If they are just your rail skis, you dont really need to worry about the skis core weaking and also weaking the flex...and usually you can get a mount for free from the shop guys, but if not it will run you around 10-25 bucks, depending on your shop.
"So I jump ship in Hong Kong and make my way over to Tibet, and I get on as a looper at a course over in the Himalayas. A looper, you know, a caddy, a looper, a jock. So, I tell them I'm a pro jock, and who do you think they give me? The Dalai Lama, himself. Twelfth son of the Lama. The flowing robes, the grace, bald... striking. So, I'm on the first tee with him. I give him the driver. He hauls off and whacks one - big hitter, the Lama - long, into a ten-thousand foot crevasse"