...But....... sometimes I score big...
I make a habit of scouring flea markets, thrift shops and internet listings. The really good stuff I keep (mostly for a while only), the other gear I sell for a profit, which has gotten me a beginners Nikon DSLR set in the past. With this set I started to make some money, and since have upgraded to a professional Nikon DSLR set and my favorite camera, Leica M3 with a set of M-Hexanons.
You need to invest a lot of time, several hours a day sometimes, but you get to handle a lot of gear, allowing for a well founded choice of what you'd like to use yourself.
My best finds:
Nikon FM2n with 50mm 1.2 EUR 50 -> EUR 250 sale
Minolta CLE with all three lenses and flash for EUR 300 -> EUR 850 sale
Konica Hexar AF EUR 35 -> EUR 375 sale
Yashica 35 GSN with lenses EUR12.50 -> EUR 100
Selling is time consuming as well, since you need to read up on gears' specifics and shoot good photos of the gear you're selling.
Moral, never pass up on old gear offered to you!