gamerprinter
Mapper/Publisher
Adventures aren't the big sellers any more.
I think Paizo would beg to differ. The Adventure Path line, by Paizo's own admission is the primary product line that drives their business. While the Core rulebook is their leading product, the APs follow closely behind.
I've heard the stated "adventures aren't big sellers any more." and that seems to be what WotC thinks, yet the lessening of success after initial release of an edition can be directly pointed at the lack of good adventure material. I'm more inclined to think WotC is clueless regarding how best to support their products - Paizo is not.
While it's true that many GMs prefer to create their own campaigns and adventures, many of those GMs lack the time to properly prepare for weekly or biweekly gaming schedules. So, well written adventures are sought after more these days than one might suspect.
Of the Kaidan (Japanese horror) products from Rite Publishing, that I develop including guide books, supplements and adventure material - the adventures are what sell the most. So IMO, whoever says "adventures aren't big sellers," don't know what they are talking about.