In the monthly open where it costs 500 credits to enter, the first prize is 20,000, 2nd is 17500, 3rd is 15000. This is total prize money of 52500 credits. At present there's only 11 people who've enterd (and judging by the three top scores, doubt anyone else will enter).
This gives a entry fee of 5,500 for WGT. You don't need to be much of a mathematician to work out the amount of loss WGT is making here (if you call virtual money a loss LOL). But its not good business for wgt when we pay $5 to enter, but are able to spend $550 of products from WGT, when WGT have only made $55 from entry fee's.