Why are there financially poor magical people in the first place?

[lexan_r]

No: HPFGUIDX 42694

I'm sorry if I sound rather cluleless, but this has been bothering 
me for long... 

Why are there poor wizards/witches? Aren't magic supposed to make 
their life easier and more convenient? As Ron said in PS/SS, "Are 
you a witch or not?!" 

See, magical people can conjur things and transfigure things. Of 
course, I don't think they are allowed to conjure money and 
transfigure something to money--I bet the Ministry has a way of 
detecting counterfeit money. 

But what about other things? To illustrate: why not transfigure your 
one's old clothes to stylish expensive ones? And they can conjure 
things out of midair, right? Like Mrs. Weasley conjuring sauce out 
of her wand, remember? And it's not just about clothes. It's about 
everything. They can do endless things with magic for their own 
convenience! So why are there poor magical folk?

Lexan