The problem, is that you're a slave to the sunk cost fallacy.
You have so much invested in your gamertag that you are motivated, no, DRIVEN to spend more and more money on it. You have become a slave to the gamertag, when in reality, everything you've put into the tag......what you've spent is already gone. It's not still there. Spending more money does not keep it around because the gamertag is JUST YOUR OWN MEMORIES OF THE PAST!!
Think about this. WHy is your gamertag so valuable? Because it's YOURS. Nobody else's gamertag is worth anything to you, but you can imagine what they'd be worth to those people who own them.
Gamertags are inherently, of no value. They are only a symbol of past expenditures; expenditures of time, money, and laughter. But, those things already exist in your own memory. Therefore the gamertag is worth even less than money because you already have a gamertag....in here *taps head with finger*
And your friends? You will soon notice how they are slaves themselves. They will exclude you, but you will see how much they invest into their tag, and soon enough you will see it isn't worth it.
That's how I was with PSN. Just go out and stop spending this kind of money on something that you obviously, and understandably revile and despise, but are afraid to let go of.
You aren't defined by your gamertag.
:D
Now go buy some ps3 games.