I'd like to clarify that buying gems with real money is not the only way to attain them. Gems are integral to the economy in that other players buy them off you for gold. On this basis, it's simply a matter of time versus convenience. Since some people don't play as often as others, and might be able to afford putting in that extra dollar or two, they might get more incentive for providing the gem vendors while raking in the gold from players who prefer to spend time in-game to earn their gems.
I thoroughly enjoyed every aspect of the beta. Got to level 20 with my Thief and have never had so much fun in MMO combat before. Everything about it is challenging, exciting and active. You really need to concentrate, and you feel like a badass when you pull off a hard encounter.
If you're interested how the combat feels and operates (when not a giant clusterf*ck), read on, but I expect lots of tl;drs.
The best example is probably in the personal story. For my human female thief, I was attempting to gather information from a captain at a brewing monastery (they literally worship mead), when centaurs try raiding the place. Dual daggers and shortbow in hand, I had to fight back wave after wave, dodging arrows and avoiding slashes with my eyes fixed to the screen. Eventually, the centaurs' leader turns up at the front gate and starts shouting to see the "hero". The captain looks at me disconcertingly and says I should probably see what he wants. I step outside the front gate to see the leader, and he starts screaming about how I think I'm better than he is, and challenges me to a one-on-one duel, immediately charging at me. This is where skill and forethought comes in to play, unlike other MMOs where I would just hit 12341111234231:
The moment he puts that sword ahead towards me, I throw down Caltrops (mini-spikes scattered all over the ground). I jump back as his hooves land on them, and he immediately groans and limps, a lot slower than before (condition applied). Taking advantage, I pounce forward and use Leaping Death Blossom (basically a front-flip over the opponent while striking with both daggers). He's now bleeding rapidly (condition applied). He turns around as I throw a knife at him to cripple him even further (condition applied?). He suddenly raises his shield and the knife comes flying right back at me. Somehow, my immediate reflex is to hit Shift, which luckily was my custom dodge button. I roll out of the way as the knife skims exactly where my face had been. He keeps the shield raised and remains still. Smiling to myself, I switch to my shortbow and fire. Obviously, he still thinks his defence will work, but I had actually fired an AoE arrow, cluster bomb. It sails overhead and I detonate it, raining loads of explosives over the top of him. He starts limping away to get some distance, and I leap forward with Heartseeker (a dagger pounce that does more damage the less the enemy's HP is). It connects directly and he falls dead. His friends immediately make a run for it as I turn around.
I've never had a fight like that in any MMO. Ever. It's just incredible.