Cuz me wants it for 12.50 tops. Besides, if I were going to spend that much money, I'd just go over to Witcher 3 GOTY edition and plunk it down there since it's apparently one of the best games ever made and LOADED with content for that price. (which I've seriously considered doing this year anyway)
Fair enough @ the cheap factor. We all want our games cheaper.
But, we also have to take into account a few things here when wondering why GTA5 still is $30 on Steam and WD2 is $30 already at places + $40.xx on Steam.
Watch Dogs 1 is a newer franchise, which likely has not even reached the level of GTA sales, brand-name & in recognition. GTA series has been around forever and pretty much also innovated this kind of style of game (3D crime-based open-world third-person action/shooter with vehicles).
If people are going to buy a game when it's expensive, the publishers + dev's probably figure "Why even drop the price that much?" Blizzard's games never drop that hard in price normally for a long time. Rockstar is getting away w/ it on GTA5, also. I mean, hell - GTA5 is right now #2 on the Top Sellers on Steam.
Do you really think Watch Dogs 2 would sell as well at $60, since it just came out? GTA is their main competition, basically. They (UbiSoft) basically have to drop the price to get people to buy it; especially after how people reacted to the original game: i.e. most were disappointed. WD2 is $40.xx on Steam and #4 on Steam right now - and Ubi games are usually way more expensive on Steam anyways; same w/ Rockstar's games. You can get GTA5 cheaper, if you go Non-Steam - GameBillet has it for around $23. You know, these guys (Rockstar + UbiSoft) will also have to give Valve a 33% cut and all if you're buying a Steam-version of their game via Steam.
I also doubt Watch Dogs 2's online portion is anywhere as huge as GTA5's very own separate GTA Online portion, also.
Also, while W3 has tons of content for the SP gamer - keep in mind, Witcher 3 doesn't even have Multiplayer here. Not that it needs it, anyways.
Also, I doubt CD Projekt will play the same kind of pricing shenanigans as a Rockstar + UbiSoft normally do. In terms of selling their TW3: GOTY in sales, it's been $30 for GOTY on GOG in a recent promo + right now is currently that price on Steam.