The value of collectibles is hard to predict. One day you're sitting on a gold mine, the next day you can't give the stuff away.
I think your plan is pretty low risk, but if you really want to maximize the possible upside of your investment you should buy a complete set of the LPs, leave them unopened and resell them as a complete set.
On the downside, I don't think that vinyl will continue to be considered to be the best audio format indefinitely. I believe that a high-res digital format will come along one day that will improve on the sound of all the formats that are available today.
I think your plan is pretty low risk, but if you really want to maximize the possible upside of your investment you should buy a complete set of the LPs, leave them unopened and resell them as a complete set.
On the downside, I don't think that vinyl will continue to be considered to be the best audio format indefinitely. I believe that a high-res digital format will come along one day that will improve on the sound of all the formats that are available today.