Ok lets break it down a bit.
From one side you can make about $5 per week or 10c per post as the most sig posts offer, and as soon as you stop posting those pocket money are gone.
On the other you can be taking 30% from everyone that clicks your sig and goes to the site and take those 30% for years to come... Knowing that gambling is huge business and single person can easily gamble whole BTC or so.....at least for me the choice is obvious. Hell, even the fact that how much I will make will be kinda of a surprise is attractive to me

The bitcoin community is supposed to be a visionary bunch, people that can thing in perspective, i would take opportunity to make uncertain hundreds or thousands before opportunity to make guaranteed money but $5....
If you are going to skip this opportunity at least click my sig to help with achieving mine
