When I designed our house 31 years ago, I saved about $75 by using pull chain lights in three closets. The savings was the cost of wall switches and additional wiring that I didn't have installed. It was probably less than that. Today you can buy a pull chain light fixture for about $4.00 at Home Depot, so you can see we were going 'big budget'.
So what's the big deal?
They don't last forever.
And they are just as much trouble to replace as a $500 fixture. But you don't have a switch so unless you want to get into that, you end up with ... another pull chain fixture for your trouble.
"But, they are so simple; what could go wrong?"
1] The little mechanical chain operated switch breaks.
2] Most of 'chain' is actually a cotton cord. On a ceiling-mounted fixture, the cord 'burns out' from touching the lamp. (Mount to the wall or add real chain until past the lamp.)
Wiring is simple without a wall switch - cheaper by $50 or so. But if you want 'cheap' or the aesthetic, use a wall switch. You have been clued-in.
Side issue - why the f$!k can't anyone make a 100w incandescent equivalent CFL that is actually equivalent instead of 20% less bright. I am about two more trips to the hardware store away from having memorized the lumens I want. I'm sure the NSA is behind this.