I am not in a union, there isn't a union involved at all within the company I work for, and they have north of 350 employees.
We all negotiate our own pay scales, for which mine is above average because I am a valued worker and can negiotiate for myself, and we receive very good benefits (private health care, sports tickets, days away etc) for free.
Why do I need a union? I'm not impoverished, despite you saying I should be without a union...
But then again I'm in the UK.
What sucks in the US is the concept of "union shops" where you *have* to join the union, or at least pay union dues, regardless. You can't work there without paying the union their cut of your pay packet. That's bullshit right there. A union should not be able to stop either an employer or a employee from having a relationship which fully excludes the union. Being part of a union should be 100% voluntary.
Unions are the equivalent of dragging everyone down to the same common denominator - if you are a decent employee working for a decent employer, you lose more than you gain through being part of the union and unable to negotiate for yourself.