Don't worry!
Its actually quite interesting - for GS and MS tourneys, they give 5 points for a first round loss, but for IS tourneys they give nothing. I remember they used to give 5 points even for IS tourneys, but they changed it. What i don't understand is why they kept it by GS and MS tourneys - why do you deserve anything?
Well, let's face it, for those who ACTUALLY qualify on merit for IS a 5 points for losing R1 isn't even gonna make it into their top 18. So there's very little point handing them out. But if you're gonna award points for qualifying in MS you've got to make it beneficial to accept a WC. Cause you can't possibly give more points to those who don't even make it to the first round. Otherwise no one would ever accept a WC.
And because MS and GS are compulsory I suppose there has to be some sort of points penalisation for not showing. And you can't take points away from them. So giving everyone who does show points, in a way, is a penalty for those who don't.