That's how it is for me.  
 
I started raising chickens in 1997 for our family.  We had an assorted backyard layer flock.  They weren't real productive, but they were pretty.  We experimented with Jersey Giants, Brown Leghorns, RIR, Buff Orps, Light Brahma, Barred Rock, Ancona, and many more.  Large fowl take up more space and are less productive, and when we needed to pay huge legal bills to protect our farm, we switched to red sex links and black sex links.
 
We raise the red sex link layers for the core of our business.  They produce a steady income and we treat them as a "unit".  We sell the laid out hens as well and recoup over half of the initial cost of the started pullets.  Egg production pays for feed costs, farm expenses, and a small income.
 
Then we started raising turkeys for us, then for family, now for market.  We went from raising one a year to raising 50 a year.  Like eggs, if we raised more we could sell more, but we are space constrained.  Turkeys are a challenge, but they are profitable, especially the BBB an BBW.  And if I ever have surplus poults I can easily sell them.
 
But for me, it's not all about profit.  I've always kept a few Ameraucanas or EE just to add color to the cartons.  I've decided to give up raising the BB turkeys entirely.  This year I am even hatching out all my poults instead of buying them (I hope, anyhow...I sunk a lot of money into eggs).  And I am establishing a small "backyard flock" which I hope will be self sustaining in a few years so we always have young birds and old birds, and a nice variety of colors in the cartons.  Whether we can produce these and hold the price, I don't know.  Whether they will lay through the winter like the RSL, I don't know.  But I'd love to get to a large scale "backyard farm".    I have a hard time telling one RSL from another, I want birds with individuality.