If it's a really valuable name, forget it, someone on the inside (like an employee) of the drop-catcher has advantage over you. But if you're looking for 3rd-rate and lower drops, knock yourself out. Oh, by the way, Snapnames has a history of shill-bidding in probably thousands of auctions over a period of years.
http://www.socaltech.com/oversee_s_snapnames_hit_by_domain_bid_scandal/s-0025031.html
If that link doesn't tell you what you need to know, merely Google "Snapnames Fraud" or "Snapnames Scandal" for lots of documentation.
If you believe one lone employee was responsible for all the fraud, and no one else knew about it, then you are probably fooling yourself IMHO.