You can't really know ahead of time wether you will find something fun, or useful, now can you.That's something they should consider when they sign up for the payment plan.
I've personally always found XBL gold to be of dubious value at best, seeing as everything MS offers is offered for free on the PC (and also on other consoles.) There's no reason for me to want to pay MS just to be able to host multiplayer matches on my own console, for example.