1) This is an easy decision. Take 5g a day. CT's recommendation is excessive in any light, and he made it for a very specific purpose anyway. Just because it's cheap, doesn't mean you should squander it.
2) No. As long as you're well hydrated.
3) It's about as equivalent to the other bulk buys I've seen, maybe slightly cheaper. And please, try to limit asking questions about whether or not to look for other supp brands on this site.
No offence meant, sorry, but really if looked at from a quality/value standpoint, I can't think of another brand that can come anywhere close to the quality and forethought of Biotest at the same prices. Biotest comes in the moderate price range because they sell cutting edge supps at discounted prices, as a service to their customers.
It's just a matter of budget is all. If you have the money, don't buy anywhere else. If you don't have the money, buy whole food instead of crappy supps.
Not to bust your balls, or sound like a Biotest ad. Just 2 cents from a long-time customer/reader.