Digitize.

>>4099
But I like physical.

>What do you do about manga preservation?
Nothing, other than not throwing them away.
>In what way do you store your manga?
On my bookshelf.
>Do you use these manga sleeves/bags? If so, where do you buy them?
No, but I do have a few historically important German books from before 1945 that I store in plastic bags that I bought from the local drug store, they cost me something like $1 for a pack of 20.
>If your manga have started yellowing have you tried those chemical yellow stain removal techniques?
No, I think the yellow color adds charm. I don't smoke, so it doesn't get too bad.

I used to have a massive collection back in middle school, then I had to sell it all because I needed the money and now I'm kinda strictly digital only. Recently I found myself buying again some of my favorite works in paper format but I don't plan on rebuilding my old bookshelf (I don't even own a bookshelf anymore).