According to j-archive.com, the average winning score this season to date is $18,443. While I certainly wouldn't complain about winning that much, it does seem a tad low for a show that prides itself on being the toughest quiz on TV, especially considering Wheel contestants regularly win $20-30K with far less effort.
I think the current values hold up fine. IMO, $100 in 2001 vs now is a little different than $100 in 2001 vs. 1984, if that makes any sense.
In the 80s, with the original values, you saw several <10K wins on
Jeopardy! (if not less), which amounts to a little more than 18K in 2016 money. If you wanna go way back, a contestant in the Fleming era prolly won on average, what, $1,000? That's roughly 8-9K today. To me, the excitement comes from a longtime champ racking up a nice six-figure haul.
I honestly think
Wheel actually gives away more cash and prizes than necessary, but I'm also not the EP, so there you go...