Upgrading your account is well worth the money.
You gain lifetime access to Classic playerworlds, access to Gold Servers, a forum account, a graal2001 email account, the ability to post news and screenshots on the GO website, and these "personal playerworlds" Stefan keeps on mentioning.
I don't quite understand what you mean when you say that the price is high. Graal is a lot cheaper than the majority of the other online games out there, and has some of the best features I've ever seen for an online game. (Development tools, the ability to create and manage your own playerworld, the ability to easily communicate with the managers, etc.)