I'm a little different than most FTers; as my signature eludes to, I don't fly much (and have only ~160K UA miles and only ~11K combined SkyTeam miles as of now). But, I put 99% of my personal spend on my AmEx Plat, and it looks like at current levels, I'll be running ~110K pts/year on that (which, IIRC, will xfer 1:1 on SkyTeam, and even more with some of the periodic bonus offers).
But say, by this time next year when I'm over 200Kpts(mi), I'll still be a bit loath to spend 'em- it seems like it takes forever to make 'em, but they're gone fairly quickly (esp. since for all but the most expensive flights I'll just buy the ticket(s) outright).
I do sometimes wonder what's the best benefit with the miles I do and will get, though.