Hello Adri,
Nowadays, it's very hard to distinguish which sites are legitimate or not.
What I usually do is use a free tool that helps in distinguishing a website's reputation, identity, and even relationships. This super cool tool is called Verify1st.com. You can see more details through http://verify1st.com/quibids.com.
Upon further research, here are some more information that I'd like to share with you:
1) For the domain's details, check out http://www.whois.com/whois/quibids.com - you'll see that the business has existed since May 19, 2009 and intends to stay until May 19, 2014. Who knows if they'll continue the business or not? Having existed for around 3 years is not enough to gauge if a business is truly viable or not.
2) Its current global Alexa ranking is quite high with about 752 sites linking into their website - http://www.alexa.com/siteinfo/quibids.com. This means that a lot of people are coming in and out of their site, which by the way, is based in the US. The lower the Alexa rank is, the better, because each site is competing with the other websites in the internet.
3) Their site hasn't been blacklisted yet according to http://rbls.org/quibids.com, which is good. (But their existence may not be enough to get into trouble yet, right?)
4) Other reputation tools didn't find any web issues/threats (which is a good factor) BUT there are quite a handful of customer reviews that marked the site to have Poor ratings in terms of trustworthiness, reliability, privacy, and child safety. Such reviews can be seen at http://reviewopedia.com/workathome/quibids-com-reviews-is-quibids-a-scam/ and http://quibids.pissedconsumer.com/.
5) Upon checking their site, I may not see any valid contact number but there are About Us, Customer Support, Terms & Conditions, and even How It Works pages. Perhaps it's better to read through each and learn more because not all scammers have such but I can't say that they're totally risk-free either. (I saw a similar site that operates in another country.)
Bottom line, it may be too good to be true but it’s still up to you how much level of risk are you willing to take - to deal or not to deal. If you still have a bit of skepticism, just trust your gut. Gauge the reviews and information that you have seen.
Hope this helps in your decision-making!