Behind a domain name there can be some abuse information from registrars used to leverage your domains, or your traffic and even more serious your money to their advantage.

• Data Expire Domain Registrations: Whois DomainName Search. When you must register your domain name for 5 years sometime can happen that some registrars will pay the registry for 1 year and pocket the rest of your money. Yes, can happen! However, there is one way that allows us to act quickly and check up if domain name is registered for that years. You can verify the real expired domain names through a free whois lookup tool like EasyWhois. The Whois system, if you don’t know, is basically a Internet’s directory that give you the ability to quickly and easily find if the domain is already registered and if so it allows you to looking the number of years you paid your registrar for. From here all of information varies on base what the domain is.
• Scams And Fraud. There are a lot of complaints relating to domain names sales and use. However as I said before, we have the tools that allow us to check them because every time you register a domain name, the informations of that domain registration must be published in a publicly accessible database called Whois.
• Domain Slamming. The practice of “domain slamming” is becoming more pronounced recently. To help prevent some of spammers send any type of marketing spam when people register a domain name, I’ve used free service to protect my email address called MyPrivacy.ca. 
• Free” URL Forwarding. URL forwarding is a technique on the World Wide Web for making a web page available under many URLs. For instance, URL forwarding is used when a web site has need to change its domain name, or an author has need to transfer his or her pages to a new domain, or two web sites might merge. You can opt-in to choose URL forwarding when you register domains or add it later as a value add-on service. Some people may wonder why the price ranges vary so much for domain registrations and what the difference. Well the low cost often is due by other tricks as sell pop-up or pop-under advertisements on your domain.

Conclusion

In brief, whether you want to register your domain from a registrar you must check that:

• Lets to keep to access on your whois records,  nameservers, mail exchangers, and hostname records.
• Registrar keep visible the fees.
• Allows to pay before, the registry for the same number of years you order.
• Give you a free whois email privacy service.
• Registrars doesn’t try to monetize through your domain or sell you services you don’t need or want.