They'd get more signups (and more of them would be for traditional accounts) if they did some fairly trivial work to make the sign up process sound like it actually created customer value.
Here's their home page: http://www.shopobot.com/
The button to show that modal window is "JOIN NOW" with microcopy "It's free." That microcopy is the best part of the whole experience.
Clicking the JOIN NOW button brings up the modal window:
"Welcome! How would you like to sign up?"
Absolutely nothing here promises benefits to the customers. Consider something like:
Button: "Start Saving Money!"
"Save money when stores change prices. How should we tell you?"
[Login with Facebook] or [Get an email]
microcopy: "We never post to Facebook. Shopobot is totally free. You can stop getting email at any time."
Clicking "Get an email" would bring you to the signup form, currently a DailyCred interstitial, which is (at present) an experience which will not maximize conversion rates, to put it lightly.
https://www.dailycred.com/oauth/authorize?client_id=ceb6f715... That page should:
1) Remind people why they want to sign up for Shopobot
2) Have button copy which suggests value, rather than "Sign Up". Ideally, it should have copy which recalls the scent of the interaction on their page.
3) Continue providing risk-reducers like "free", "we won't spam you", etc.
If you're wondering whether to use DailyCred or roll your own login system, by the way... how much is 20 ~ 40% more users worth to you? Enough to justify the whole hour it will take to roll a login system? Good, thought so. (+)
(+ I'm sort of intrigued by the parts of their offering which do not actually sign up users and log them in. However, it strikes me that bundling them with logins is an exceptionally bad idea, and as you need them you can either implement them ala carte or plug in a provider who would let you keep control over the most important 30 seconds of a customer's relationship with you.)