You are, and so are most reasonable people. They're completely unnecessary, Guild Wars 1 had neither and it's still as healthy as it always was. There can be arguments invented, but standing against GW1, they become clearly fallacious. In my opinion, taking both costs away from GW2 would do a lot to make it a more fun less grindy game. And closer to the original design ethos that ArenaNet had planned out.
GW1's economy was broken within one year therefore the premise of your argument is invalid. Simply existing does not make something perfect, although you can't even say GW1 has the existence of an economy, it has the shell of something that resembles an economy. Hard to take a clearly flawed set of logic seriously, especially when it is mindlessly repeated so often. It does identify your problem with GW2 and why you like games like GW1, GW1 is so easily broken and exploited you can be extremely powerful with no drawbacks, which is quite sad that you base your criteria of a "good" game on that.
So I (and anyone else) can inject new gold into the economy just by paying real money right? If I have a million dollars to spare, I can inject A LOT of new gold into the economy. This is where I would expect ArenaNet gold sinks to come into place to balance it out. So the gold sinks should be designed to be able to balance the projected inflation resulting from the cash shop.
Thus, my reasoning for the gold sinks being there as they are and why players feel the urge to either farm or pay for gold.
In order to buy most of the materials for a legendary weapon it would take approximately $80,000. Unless you're going to use the gems there is little reason to buy them. The "buying gold" argument is extremely exaggerated.
Wrong. It does not inject new gold into the economy, it shifts gold from one player to another, which occurs in the economy anyway as that is the purpose of any economy. That is an elementary aspect of the operation of the gem trade. Ignoring the basics of how the system works doesn't help your credibility on the topic.