how have the tables changed over the years? I think i've heard of only one change, has it been more frequent than that?
one really big change to reduce the gap between weeknights and weekends at all resorts - it was painful as many had gotten used to the cheaper sun-thursday stays...
several smaller changes to reallocate THV point costs with SSR, BLT standard views and theme park views (due to too many theme park view villas originally that were crummy views) and an early reallocation at OKW. i think BWV may have had one adjustment as well.
you can see some of the results of the reallocations in the links below:
2014 point chart for OKW
original pt charts for OKW (thanks to webmasterdoc).
if you wanted a 1BR at OKW for 7 nights in may 1994, it would have cost 200 pts. if you wanted a 1BR at OKW for 7 nights in may 2014, it would cost 199 pts.
OTOH, if you wanted a studio for 5 nights sun-thurs in early december, your 35 pt stay cost in 1994 has now increased by 43% to 50 pts. weeknight stays have taken a hit...but if you just stayed 2 nights on a weekend in early december at OKW, your 34 pt stay in 1994 dropped a bit to 26 pts.
so when some numbers go up, others have to go down. or if everything goes up (as at BLT a couple of years back), then they have reclassified some rooms in the underlying room categories (i.e. there are fewer expensive "theme park view" villas at BLT now than a few years ago - and the extra pts from the formerly expensive villas got spread across the
point chart.)
if you typically stay for 7 nights, i doubt you'll see any big changes (although early dec is popular enough that it won't surprise me if they move it to a different season.)
timesharing definitely involves a risk of change, so take that into account.