All of these things can damage not only the appearance and quality of the work of art, but can also adversely affect the resale value of the work, potentially causing you to lose money on what might have previously been a good investment. A good restorer can do wonders in bringing a painting or other work of art back to life. Timely paper restoration and archival matting and framing is also very important when it comes to mitigating the problems that tend to occur with works on paper.
I can also help you identify condition problems in works you might be interested in purchasing. Auction houses tend to provide condition reports when requested, however understanding the implications of the issues described is a different thing. Knowing how much money you might need to restore a work of art is a useful thing when going into a negotiation or an auction. I can provide a second look at something you are thinking of buying to give you a better sense of the condition of the work and what might be needed to keep it in good condition.