My film/filmmaking obsession can be expensive, thought it depends.
My DVD/Blu-Ray library is up to around 500 films now, so if you estimate $10 per film (some were cheaper, some more expensive), then you're looking at $5,000. That's over the course of my film-collecting life, though, and I've been actively collecting for about 15 years, so that comes to a little over $300 a year.
I also collect original theatrical release posters, which I usually find on Ebay for around $20-$30 a piece. I have 10 on my wall right now, but have several more in storage, so that's a few hundred, I guess.
My laptop, a MacBook Pro, was $2,200, and was purchased primarily for film editing purposes. I also have a couple thousand dollars worth of film and photography software on my computer.
The film equipment itself is cheaper than what would have been possible only a handful of years ago, but I now make films with a DSLR camera, which I also use for my photography, so it cuts costs significantly. My camera was was about $1,000...the lenses probably another $1,500. My movie makeup kit was about $150. I have cheap studio lights that were only about $75 (DSLRs don't need a lot of light for video). My audio equipment was a couple hundred.
I guess if you count school, where I studied film, then throw in roughly $20,000...and if I get accepted to the American Film Institute, then we're talking $120,000...so, yeah. 
_________________
Aspie Quiz: AS - 141/200, NT - 77/200 (Very likely an Aspie)
AQ: 34/50 (Aspie range)
EQ: 32 / SQ: 68 (Extreme Systemizing / AS or HFA)
Diagnosed with AS and Anxiety Disorder - NOS on 03/21/2012