EDIT: The total credits for each of the tournaments below was 800 in the Tour Pro tier with a 144 winner share of credits. Corrections are listed next to the strike out info...sorry for the confusion.
I don't know anything about the e-mail you got from WGT, but I did I check the tournament standings for WK 49 and Wk 50...9 hole Unlimited.
WK 49, you were in 54th
place. The total purse was 100 800 credits with a winners share of 18 144 credits. 54th alone paid 0.232 percent of the total purse and you were tied with 108 other players...the pay out was (virtually) zero for each of those tied in 54th place.
WK 50, you were in 39th place. Again the purse was 100 800 credits with a winners share of 18 144 credits. 39th place paid 0.450 percent of the total purse and you were tied with 81 other players...the pay out was 0.01 each for those tied in 39th place.
Joey