In response: Eh, your prerogative I suppose. Here are some confusions/counterarguments I would put forward:
First, I don't know if there is a difference between buying/selling and "flipping". As far as my vocabulary goes, "flipping" is buying low, selling high. Unless "flipping" is specifically using buy orders and sell orders as opposed to buying at the listed price and selling at the listed price, I know of no difference.
Second, I personally find your 300 gold claim hard to believe. Using buy orders and sell orders... Ok, sure. But since you specifically claimed you weren't "flipping", its harder to believe. I'll leave that one aside though since I wouldn't know.
Finally, I agree that it would be stupid to pay for something that is free somewhere else, but that's not the case. Gold Wars 2 has, from my personal experience with it, a much more advanced, clean, tool rich environment. The idea and rationale behind paying for it is that the time that you save by using Gold Wars 2 over other sites could be used to make real money, thereby paying for itself. If you would rather not pay for it, that's your choice, but bashing a legitimate tool just because you don't like that you would have to pay for it is dishonest. Now if you've payed for it before, and you find it to be no more helpful than free tools, then go on making statements, but support them with comparisons at least. It is your job to prove a claim, not for anyone else to disprove it.
That really sounds like fun......
2: If one was not interested in the TP and the economy of GW2, I highly doubt that they would even know such tools existed, let alone use them or pay for one. If by this you mean to say that if you use this tool, then you must not be truely interested in the economy of Guild Wars 2, then you are over generalizing things. As an analogy, a normal person and a stock broker can both be interested and invested in the stock market, but since the normal person only understands the general principles to making money (buy low, sell high), they use tools to help them out. However, even though the stock broker could manually look through all the stocks every day, he too could benefit from using a stock market tool. The same applies to the TP in game, to a point where the analogy is almost exact. Both newbies and experts of the TP can benefit from this tool, perhaps the experts most of all since they can better interpret the data.