I once took a personality test. One part of it corresponded to product lifecycle: 1 was initial conception, 2 was prototype, 3 was roll-out, 4 was major enhancement, and 5 was maintenance. My personality is that I prefer prototype to roll-out. (In initial conception, there's too much uncertainty for my taste - everything is possible, but nothing is nailed down. And maintenance is boring.)

My point: You don't have to give a rational explanation of why you prefer maintenance. You can do so from your perspective, but it won't translate to those who, due to their personality, prefer other phases.

But if you want to say that projects that made it to maintenance should have money available to pay you, then yeah, you've got a point that transcends personality...