If there was one person to get people addicted to killies, Tim would be the one. And he is definatly not out for a quick buck, i had a problem with some killies i bought off him which died, it was my own fault but they were replaced free of charge with a few more thrown in aswell, not very often that happens these days.
I started off with one tank. With the intention to buy one or 2 species i walked away from tims with about 5 the first time. Then i had to buy more tanks and equipment. Then next time i went i got more species, I have 5 tanks now with 10 more on order.
Be careful killies can be addictive, however that is not nessecarily a bad thing. I would say it is a great thing to be hooked on.