Quitting Thieves Guild Quests

After you join the Thieves Guild, are there any consequences for quitting a job you get from either Vex or Delvin?

I recall Delvin saying something along the lines of:

You keep quitting these jobs, and I might stop assigning them to you.

Is that true?

Solution 1:

There are no consequences - they are just commenting and there's no bite to their bark.

If you want to complete all the side quests and 'Return the Thieves Guild to its Former Glory', quitting jobs in cities you've done the special quest in is the only sensible way way to do so, or you'll be there for a long time.

Solution 2:

That's certainly untrue. I quit for another job whenever I got an assignment in Markarth.