HBP's potions discoveries - why keep them secret?

[bocadetomates]

No: HPFGUIDX 140103

So, finally I come out of the dark corner I've been lurking in to put 
up a question that's haunted me for a few days now. I hope this 
hasn't been brought up before: Has anybody ever wondered why the 
discoveries a schoolboy (an exceptionally gifted one, granted, but 
yet a schoolboy) made twenty years ago about better ways of making 
well-known potions haven't found their way into the "official" potion-
making guidelines (as Hermione calls them)? 

Since there are no universities of magic, Hogwarts is probably one of 
the most important sites of academical learning, at least in Britain, 
unless there are any other academical institutions we have not heard 
of yet. (There is the department of mysteries, of course, but I think 
Hogwarts would be in the same league.) Snape, as Hogwarts potions 
master, should therefore surely be considered one of the most well-
respected scholars in potion-making, shouldn't he? So he would not 
have problems finding a publisher. 

The answers I came up with are all really unsatisfactory. Option 1: 
Slughorn is really old and has been in retirement for quite some time 
before he goes back to teaching. So maybe he's a little behind on 
recent developments and that's why he sets his students a book that 
hasn't been revised for ages. (Obviously hasn`t, since the other 
students copies are identical to the old one of the HBP.) Somehow I 
don't think so. We have seen the Weasleys buying some books second 
hand, and they have never had problems with any of them being out of 
date. And the way Slughorn talks about, or rather to Snape makes it 
quite clear he acknowledges Severus is a genius when it comes to 
potions. (At his party, when Slughorn praises Harry and says, "I 
doubt even you, Severus
") So if there had been a better book by 
Snape Slughorn had known of, he probably would have used that in his 
teaching.

So is Snape simply modest and doesn't want to display his 
superiority? Bit out of character, don't you think? Or maybe not? We 
haven't seen him boasting that much, or at all, come to think of it.

Then, there's of course always the possibility that he put his 
knowledge to some dark use or simply didn`t want to lose the 
advantage of knowing more than others by publishing it (ESE!Snape, 
OFH!Snape)

Most learned people I know, and especially the ones who, like Snape, 
seem to think there are few people who are quite as good as they 
themselves are in their area of expertise (compare Snapes speech in 
PS, where he tells the students what he could teach them if they 
weren't as stupid as the general idiots he usually has in his 
classes), are nevertheless eager to discuss with those few they 
accept as equals. And the usual way to get in contact with them and 
prove you are a worthy discussion partner (at least in the muggle 
world) is by publishing. 

It's been argued on the list that what Snape wants most is 
recognition and also that he is quite devoted to science and 
learning. So why on earth has he been sitting on those HBP 
discoveries (and probably many more he made in all the quiet years 
when he was a teacher and Voldemort was Vapormort) for so long?

bocadetomates