I agree, plus you can keep costs down if that is of concern.
Take a non-stop revenue flight NYC-PAR in Y/Y+ then fly back in F.
LH are good to release F close in plus you get to use the wonderful FCT in FRA if you time your flights correctly
But that would be more expensive than buying a RT.
(TS in Canada sells tickets as oneways for a reasonable price, though, but no miles)