I have more than I would like... but sometimes you can't avoid it based on the title. And I'm also a bargain hunter and that means I'll often snap up rough-but-underpriced posters that will probably require backing at some point. From what I have on the wall right now...
ON LINEN- Lavender Hill Mob (East German) - This one looked like it had been through a shredder... I had it backed and restored
- Roman Holiday (R60 International 1-sheet) - This one was in rough shape and had mold on it... I had it backed and restored
- African Queen (British 1-sheet) - This one was on linen when I got it, but it was a pretty poor job and needed to be re-backed... which I had done
- African Queen (Polish) - I bought this one backed from Bruce a few years ago. If I were doing it again today I probably would have waited for an un-backed copy... but I would still be waiting as no one has sold one at auction since!
- L'Avventura (French 1-panel) - I bought this one unbacked, but in rough shape from Bruce... I had it backed and restored
- To Catch a Thief (US 1/2 sheet) - This one I got for a song, but it was beat to hell... I had it backed and restored
- Fistful of Dollars (R68 Italian 4 foglio) - I bought this one backed from Heritage... in the process of framing it now
NOT ON LINEN- Roman Holiday (Polish)
- Le Samourai (French medium)
- Once Upon a Time in the West (WC)
- Goldfinger (Alamo/Mondo)
- Soy Cuba (R80s Cuban)
- Grand Illusion (F45 French medium)
- Jaws (small Czech)
- The Big Sleep (Bacall signed US insert)
I guess it is about a 50/50 split. I have a few more on linen that aren't displayed, but my backed-to-unbacked ratio improves greatly. At the moment in storage I think only have 4 backed posters -- Belle et la Bete (R51 French 1-panel), Touch of Evil (French 1-panel), Bonnie and Clyde (French 1-panel) and Not of this Earth (US 1/2 sheet) -- while I have hundreds of unbacked posters.
I definitely prefer unbacked posters and I don't have posters backed for aesthetics. That said, some posters are on linen or need it and they are a great deal... who was I to pass up a combined $400 purchase of the Belle et la Bete and Touch of Evil French 1-panels from above? Sure I would have preferred them unbacked, but lets be reasonable!