Affiliate Marketing Secrets

http://www.amazon.com/Sigma-70-200mm-Ape…
I’ve been drooling over this lens for a while, and my dad said he’d buy it for me for birthday/Christmas.. but I don’t know.. My dads always tight on money and A. I don’t know if I want him spending that much for me even though he’s willing, B. I don’t want to get such an expensive lens only to be disappointed, and C. I don’t know if that lens is what I need to improve my photography, I don’t KNOW what I need to improve… I’m not sure what my photography niche is yet, but I think I want to get into photojournalism and I was told the F2.8 would help.
If you want to take a look at what I shoot to see how I could improve check out www.jdipierro.co.nr or www.jdipierro.deviantart.com (I put a lot more on Deviantart to get feedback, .co.nr is my portfolio for potential clients)

I see a lot of question here about buying Polaroid or Holga/Diana/Lomo cameras. Now back in the film days polaroid certainly filled a niche. What I just don’t get is why people spend money on a Holga or similar camera while for the same amount or less money you can also buy a used film camera, either a high-end compact or a decent SLR with lens.
So, can anyone explain to me why someone would buy a camera where there’s hardly any film for or why anyone would buy a camera that’s basically a poorly made toy?