That's what I did. I soon learned (after buying it) that being certified is a very expensive way to own an airplane. My Cub was pretty ratty & timed out (read: Cheap) so I knew I had some sweat equity coming up. I also had plenty of qualified adult supervision to count on. So I went into the Owner Maintenance category so I could be the pilot with a screwdriver.
I didn't buy this as an investment, per se, it's another toy in the stable. Come what may.
I did think about the resale value a bit, and I thought that if I were buying an airplane, would it matter to me if it was cert. or OM? I thought that if it were OM, and the parts were TSO, lots of documentation & quality of work was evident, that no, it wouldn't matter to me. I didn't do this to save $$ on parts, I did it to save $$ on mechanics signatures forever.
I didn't put any WalMart parts on, everything came from TSO'd suppliers. I did my own welding for the mods & reinforcements, overseen/tested by very well qualified airplane types. My point here is that someone with a good variety of skills & common sense can do this safely. You don't think twice about changing the brakes or steering pump on your truck yourself, & I don't see a difference. (except of course, that third dimention so a bit of extra care)
As far as not being able to fly in US air, that is a minor limitation, and one that I easily accepted. I have plenty of great flying/camping/hunting/fishing/exploring/frinds/etc. up here! Of course when the "abolution of the 49th" comes around, I'll be a supporter!