I'm pretty Sure it's a scam.....There is a special add-on called WOT (Web of trust) that i use... I prevents me from the dangeous sites.
More people think it's a scam....Don't believe me, here's the link to WOT's Scoreboard for lockerz:
https://www.mywot.com/en/scorecard/lockerz.com
After viewing this for the first time, i never even botherd to join it. After all, that PROVES it's a scam... at least, in my book