First of all, let me make it abundantly clear that I know sod-all about the publishing business *LOL*
However, having said that I doubt you'll see a price-cut on the PC expansions anytime soon.
I would assume that the rebate on the TT lists are there because the rules have been in circulation for a while, and sales have dropped off since most players have by now acquired the books they want/need.
I would also assume that there's a very slow, if any, increase in the number of *new* TT players.
It does after all take some commitment to buy, paint, base and flock a FoG TT army. Not to mention the 6'x4' table needed.
Contrary, the PC version is growing by leaps and bounds (or at least moderately hopping) since it lends itself easier to new players.
Which in turn means a growing customer-base, since new players keep turning up in here.
And that's not even counting the players that never make it to the forums, which from what I can gather is the vast majority.
So if the game and expansions are selling well with the current price-tag, why on earth would Osprey/Slitherine lower the price?!?
I still think that offering the same discount for new expansions to those who have already bought the game that they offer on the package deals is pretty good re. customer-loyalty, and not something you'll find in very many companies.
(I'm assuming they'll keep doing that)
As for whether they're over-priced....
Well, that's a subjective verdict.
Personally, when I think of all the hours I've spent on this game I have absolutely no regrets that I bought the base-game and all 4 expansions, even if I am growing less and less enamored with it.
Hell, the challenge-system alone is worth the entry-fee.
So I suppose the simple answer is that if you think they're over-priced, then don't buy them.
But don't expect a company to willingly lower their profits without good reason.
Lars