Warcraft Guilds, worth it in the begining or the end ?

I recently left a guild and joined another one that is raiding at level 70. Many of the guilds you start with may not be the ones you are with at level 70. Once you hit level 70 your priorities change. You want to do high level raiding with other level 70s. Do quests with other level 70s. As I said above, I recently left a guild called Templars. This guild is ok, but mostly made up of alts and some level 70s. It kinda felt like they needed the guild officer power than be in a raiding guild. Does this guild plan on raiding at level 70 ? That was the question I was asking myself the whole time I was with the Templars. My druid my main is gonna be raiding , well thats the plan anyways. I left the Templars to make friends in a new guild that would be ready to raid when I hit 70. I joined a recently new guild, but made up of 70s. They have like 22 level 70s the last time I checked. Is that enough to do some 70 raid content. Yes, we can do karazhan which is a 10 man instance. The higher raids require more people. 25 man raids are hard for some guilds because they lose the player base. Not enough people.

Here is the list of new lvl 70 content:

Azeroth Raids

10-man:

• Karazhan
  

25 man:

• The Battle of Mount Hyjal

Outland Raids

25-man:

• Gruul's Lair
• Magtheridon's Lair
• Serpentshrine Cavern
• The Eye
• Black Temple

Future Release Raids

• Zul'Aman

Why do people leave guilds ? Is it to get more loot. The loot they want instead of fighting over with other people within the guild. If your a guild officer and your putting a group together your going to want the people with the best gear. If you have 14 level 70s. There is one pally that you always raid with out of the 5 left over but there is another pally that really wants to go. Do you pick the pally that has never been in a raid or do you pick the one that has mostly the epics on and you know that you will hardly fail with him\her by your side. If you don't pick the other pally that doesn't have any epics, you will probably hurt his or her feelings and probably go else were and left the guild. Some people might say he/she is a baby for leaving but you have to remember those people probably have epics and are picked to go week after week. Its just difficult to give everyone a fair chance at raiding if they are to far behind the guild, who wants to give a guy in greens or blues a chance to raid where everyone has epics.

Thing is you have to remember who you will need when you get to Gruuls lair where you will need more people to attend. If that person doesn't get on anymore cause when he did he couldn't raid anyway. I guess its kinda of a catch 22.

Well thats my .02 on that. later.

Raid List from wowwiki.com