Priority: throw away sites, or long lasting?

We all know there are hundreds of ways to make money on the internet - this forum represents loads of them pretty well.

But, my question to everyone that has established revenue streams is: are you creating quick throw away sites designed to make a quick buck. Or are you trying to establish long lasting branded sites to last a lifetime?

I'm not asking from a newbie POV as I have both kinds of sites, but my priority is the larger sites I have.

I always try to create sites that stand the test of time.

Definitely I would go for the sites that can last for ever.I know we need to invest a lot on that but the revenues generated through those are lucrative enough to handle them.So definitely long lasting ones...

A mix both..but even my lower end sites, I wouldn't say they are "throw away sites". I tried a few of those, and I feel it's too risky with Google cracking down. I do have some micro niche sites, which I consider my lower end sites. I just started a site which I'm targeting for the long run. Profitable niche in the health field. Creating tons of content for it (3, 1000 word articles a day). That's my long term investment. Just like any type of investment, you want to diversify.

When you want to have a steady income stream you need to go both ways.

A strategy that works towards a longtime income might stop working tomorrow. Look at the Panda updates. Destroyed a lot of sites that were build to provide longtime income.
When that happens your "hit and cash in" sites will soften the blow until you have some new longterm sites online again.