@jel and
@Couch Coach had some posts in the RMT and Rookie Discussion threads that summarised it.
In short there were 33 players who made 150k last year, several of them no one would have considered, several more did it too late to be worthwhile.
Using my starting rookies/cash cows as an example (and this is not what I made, just from the table and filling in a couple that were missing):
Average Cash Generation: $156,843.75
Average Cash Removing for 0s: $179,250
Average Including Correction Trades: $170,723.53 (removing the zero: 181,393.75)
Now these numbers are only ball park, I didn't realise these exact numbers, fwiw some guys would be higher using peak instead of final price and vice versa so probably cancels out roughly but I think it supports the 150k.
FWIW, 11 of the 19 names (starting rookies and correction targets) made 150k under the criteria, the vast majority that made 150k actually made >200k, indicating that basically players smash there way there. Of those who didn't make it there were 2 zeros (one held as a loop all season, one corrected at round 2), there was a 3rd that made almost 150k but was traded at round 3 by me. Only four, including the two zeroes, didn't make at least 100k.
There was no real rhyme or reason to the starting point for success either, of the 9 who made more than 190k, 1 was 102k, 2 were 117k, 3 were 123k and 3 were >200k.
This also ignores the 2nd wave rookies who quite often also make 150k more but probably generally don't (as we take more of what we can get, when we need it).
I think the main basis of 150k though isn't actually based on rookies at all but more on being able to make the upgrades required to finish a side. Simple theory says if I start with 12 premiums, then I need 10 upgrades, if you say each upgrade is going to cost you 500k on average then you need to generate basically 300k from each pair of "rookies" to get their 240k up towards the 500k mark and the replacement rookie.
There's also the aim for the sky because if you miss at least you'll be among the stars theory at play, if you're using 150k as the target point then you can miss and still make cash to do something with.