Some of us who buy vintage gear "on the cheap" (yard sales, thrift stores, Craigslist) will not pass up a receiver bargain, e.g., Marantz 2250, Realistic STA-2500, which I paid about $80 for each, including a tune-up. I've had these units in my rotation occasionally and they don't sound bad.
But I have very little interest in FM and am located in a semi-rural area where decent FM reception is limited to a small number of stations anyway. So I don't need a receiver. Currently, I have a Carver amp and pre-amp in the family room, which I've very happy with. I also have have a big Nikko power amp and a Rotel pre-amp as a backup, and am using a little Luxman amp (L-215 in my office).
The receivers have lots of cool lights (I also have an old Pioneer 3800 Fluoroscan somewhere in the garage), but once I got beyond the visual display, I couldn't think of any reason why I should use them rather than my separates. In general, I feel that my separates give me more control over the music.