Update: There seems to be some confusion so I'll back up the story some. My guild is a casual, 1 night a raid guild whose first raid was Wednesday night. I have never raided with the vast majority of the ~20 people who showed up in a wide variety of ilvl and raid experiences. I had players who are former hardcore heroic raiders who don't have time to raid more than 1 night a week and players who first started playing WoW 2 months ago. I have players in 505 ilvl and players in 540 ilvl with legendary cloaks. It's a melting pot. It went decently well but there were a lot of mistakes by a lot of people. I decided to implement the gold requirement in order to potentially weed out those who just want to be carried and to help identify those who would need extra attention in the raid.
So far, overall, it's worked. We now have 4 or 5 people who haven't done it yet. Some of the people - including a DPS DK and a healer shaman - had some problems in it and I was able to give advice on certain rounds to do certain things to help them. Many looked up videos or strategies - some realized after checking out askmrrobot that they were gemming incorrectly for their specs. So far: this has been a success.
My guild is a 1-night a week raiding guild that as long as players meet the ilvl requirements can come to raid. This week, this became a huge problem during Siege, as there were many many mistakes during the course of the raid. I decided to go check out proving grounds - and 1-shot gold on my DK. I didn't feel it was terribly difficult and so I asked my guild members to get gold before coming to next week's Siege.
I figured this would be a simple request. I was not prepared for the hell that broke loose. A couple people got silver and on the same day, when they couldn't get gold, /gquit. I lost a healer and 2 dps. A couple people whispered me and asked advice, and many of them were able to get through gold without problems.
Because I felt that perhaps the tank one was simply easier than the healing or dps ones, I swapped to a shaman I haven't played much in months and gave them a shot on him. I do agree - the healer and DPS ones are harder - however, I got gold on them too.
Right now, out of my guild's ~20 raiders, 9 got gold, 3 gquit, and the other 8 are working on it. 2 of the people working on it are talking about how it's unfair and that I am requiring it. What are your thoughts?
Proof that I have all 3:
I did the tank one before getting my meta.