There is a price difference, it isn't subjective. Whether or not you care about money is a personal issue, but has nothing to do with whether there is a price difference.
The bad thing for Sonos is that Google is getting into this market and overlapping some of their advantages over Airplay. If Google follows through, you will have multi-room, streaming directly from the web, iOS and Android functionality. The question is whether Google will follow through, but right now, they have a $35 device that does much the same thing as the $350 Connect.
I do think that Airplay and Sonos are different markets, but that isn't to say that one is better than the other for everyone. The advantages of Airplay are price, it is built into audio products with published specs, there is more variety, so you can get a battery operated speaker if you need one, it works with video and audio, it works with more apps, it is built into iOS, so you can access it from the lockscreen, it works with the apps built by the streaming company with all of the features rather than a limited feature list that has too work with a third party app, you can move from bluetooth in the car to Airplay at home with the touch of a button, etc.
The Sonos advantages are for people that need multiple rooms playing music at the same time or people that have archaic routers and/or need compatibility with Android. It should be noted that Airplay can also play to multiple rooms, but a computer needs to be in the mix for most applications (with the exception of Whaale app). Also, Airplay doesn't have the same versatility because it is isn't focused on multi-zone situations. In other words, if you need differnt music playing in your kitchen, bedroom, and bathroom, then Sonos can meet that need, while Airplay is currently limited in that area (Note: it is possible via Synology's DS Audio app, so Airplay is capable, but Apple has chosen not to make the feature available in their software).
Personally, I prefer Airplay, but I can see that there is a market for both.
