OK...

I accept that this is true:

From alg's most recent post (http://alg.livejournal.com/101844.html)

Too many authors find their careers in tatters because they took that $150,000 advance thinking the publisher was going to push the book harder because they paid more money for it. That is hardly ever the way it happens.

I would like to know why? Given that this is, afaik, a pretty high advance for SF (although maybe not F), why wouldn't the publisher follow up this above-average investment with above-average push?

OK...

I accept that this is true:

From alg's most recent post (http://alg.livejournal.com/101844.html)

Too many authors find their careers in tatters because they took that $150,000 advance thinking the publisher was going to push the book harder because they paid more money for it. That is hardly ever the way it happens.

I would like to know why? Given that this is, afaik, a pretty high advance for SF (although maybe not F), why wouldn't the publisher follow up this above-average investment with above-average push?