Wix and Squarespace at least are spending a ton on PPC customer acquisition. One analysis we saw put their AdWords spend at $10-25K per day (though, I'm not sure how accurate that is).
Also, both Wix and Squarespace advertise on terrestrial radio and television. Squarespace had a Super Bowl ad and I regularly see their ads on Shark Tank (ABC). I hear Wix ads quite often on AM radio.
Squarespace was on Inc's 5000 list in 2011 with 2010 revenues of 11.7M.
Wix went public recently. They had 2012 revenues of $43.68M with a loss of $15M [1].
In the "general purpose business website" space, I think all 3 (Wix, SS, Weebly) see it as a "winner take all / own the market" play (it probably is). So, they are all spending as much as possible to acquire customers.
Wix clearly isn't profitable. I doubt SqaureSpace is. I think it's admirable that Weebly is ... but I almost wonder if they need to spend more to compete.
Almost 300 employees, spending a ton on ad/marketing, and raising that much money–I can't see how they're profitable. I could be way wrong though.
[1] http://blogs.wsj.com/venturecapital/2014/04/15/squarespace-r...
Haven't checked out Weebly yet but I hope they took a "standards approach" to their sites/code and allow for proper redirects.
Update: Very pleased to see this: http://kb.weebly.com/301-redirects.html
I'm curious their main sources of customer acquisition. I assume a lot of its word-of-mouth and organic, but I'm curious how much marketing they do. Squarespace has been huge in the podcast space doing advertising and did that big Super Bowl ad splash. Wix seems to have been around for a while so I see many of their out-dated designed sites.
Edit: I did just get retargeted via Facebook ads exchange after visiting Weebly's site, so they are doing at least some advertising :)