ie - a "labor of love"
How do I pay for it? Well, I reach around to my back pocket for my wallet, and...
I don't have ads, I don't have a sponsorship, and I don't care - what I have and what I put on my website is strictly for myself and others to use or read as they see fit; I consider it a "giving back" to others out there for what the internet has given me over the years.
...and I am fine with that.
Other sites need to realize this too; not everything is worth money, and if you really love what you're doing, you'd give it away free. Like the internet used to be - everybody doing it for the love of networking and computing and knowledge and information transfer.
Not AOL spam making money crap.