In my opinion, if you have problems in your real life, you should solve these by getting involved in real life, not by living in a second.
If you get the priorities the other way around (SL = your first). I think it might even hold you back and create all sorts of problems in your real world. (hasn't this been proved many times already?)
And think this: Do you really want a hobby where you're sitting in front of your computer screen? To the real world, that's just what it is. It's a hard world, yes. But that's the thing; you can get much more satisfaction and pleasure out of it.