Oh, what a blast! So am I going to be successful just by buying PoE orbs at mmohag? *ironic voice...
No, of course not, despite the quality writing here and promotion of the website, I gotta strongly disagree.
Although, it may be that buying Orbs not from devs directly is a cheaper and all & all better option. However there are way more genuine sources than the one you promoted here. Take these 3 for example:
At MMOAuctions you can browse thru all the popular sellers and choose the best price for yourself, PoE Orbs including, so rather than picking one site, it's actually best that you skim thru all that's available and pick best. This website got an option called Scam Killer, meaning that anyone posting there is scam free, so there's even more reason to go there shopping :)