It's a hobby.
You could pick up a 29g biocube for around $300, fill it with base rock and soft corals, and have a very nice looking tank, with very low maintenance costs. Find a local reef club, and you could probably fill it with donated colt, xenia, GSP, cloves, mushrooms, zoanthid, palythoa... Tons of that stuff around. Most folks that have it are happy to share.
On the other end, the sky is the limit. You want to spend 50k on a tank? Easy. Folks will come out of the woodwork to help you spend it.
Same with any other hobby. Ask a golfer, scuba diver, firearms enthusiast... whatever. If it's a hobby, it's quite capable of consuming every spare resource you have, in both time and money. That's what hobbies are for... or not. Your choice.
Honestly, if you can't see yourself coming up with $500, and perhaps $50/month to maintain it, then you might want to take up crochet... but it doesn't have to be expensive.
Keep your sights set on something that you have a reasonable chance of success with. Everyone raves about the bright SPS tanks, hundred dollar a polyp zoanthids, super cool colored chalice... but there's nothing wrong with a softy tank.
Case in point, 10 minutes after posting this, I noticed our current tank of the month
http://www.reefcentral.com/forums/showthread.php?t=2548820
Not that he got away cheap, mind you, but shows how nice a softy tank can be!