I've always been a bit confused at all the hate aimed at Liquidation.com, and people who yell "scam" like it's their mantra. The site isn't a scam - it's a site for businesses to offload inventory that isn't readily saleable. This is NOT a place to buy inventory wholesale with the expectation of instantly reselling it, and it's not a place to get popular consumer electronics on the cheap.
I've been reselling on the internet for a few years, and last year I did so a lot more, and after my inventory from a one-off store liquidation dried up, I used Liquidation.com fairly heavily (20-30 auctions) to augment my inventory. I turned a decent profit on the items from Liquidation.com, but not as well as I had hoped. Nonetheless, I was satisfied with the site.
A lot of the items you're going to get are nonfunctional, or have cosmetic damage. You need to inspect and test everything you get. You need to expect that the high-ticket items in the manifest may not be saleable. There are a lot of unsophisticated bidders, especially for high-ticket electronics, and prices tend to be uncomfortably close to retail for items that may or may not be functional. You're generally best off avoiding high-ticket items.
On the other hand, I've had success reselling large lots of smaller items. The shipping generally isn't that bad for them, and if you take the time to properly resell them you can do 2-3x profit, even accounting for the 25% that are unsaleable.
The thing is, they're pretty upfront about what they're selling - it's bulk customer returns for sophisticated buyers. There's a reason people use the site. It's not a good site for buying for personal use, although I'll admit I've kept a few thins I got from them. Go in recognizing that some units will be lemons, but that there's money to be made. You won't be disappointed.
TL; DR: Don't buy from them unless you're a sophisticated reseller, but if you are they're pretty good.