My late father was an art buff, what I never expected (and he didn't tell) was that since I moved to live abroad, he had been collecting signed lithographs, drawing, artistic photos and rare books that now, I get to know, are worth US$80000. There are pieces by Takashi Murakami, Banksy and Lichtenstein, just to mention some famous names. The origin of these objects is well documented. He was very organized and kept records of when and how much he paid, as well as certificates of authenticity.
These object have no sentimental value for me. I'm already making arrangements to sell those that have no major chances to appreciate beyond inflation. However, I've been informed by an appraiser that some pieces may sky-rocket in coming years. For which specific pieces it will happen, and exactly when it will happen, it's harder to predict. I would like to keep them as an asset (Note: I'm well established, have no debt and don't need this cash at the moment).
Unfortunately, I often change my country of residence due to work and transporting the collection with me would be too onerous (It needs proper care and pay importation taxes every time I cross borders). Also, the yearly rate to rent a bank vault to store objects of these sizes may in the long run be pricier than the market value they could gain, specially if it takes many years for their value to increase (for instance, I can't predict when the artist will die). Finally, since these are lithographs, but no original paintings, museums aren't that keen in taking them on permanent loan, at least not for now.
Should I "eat my heart" and let these objects go at their current value or are there other safe and inexpensive ways to store them until they have appreciated?