•I farm mats for my crafting classes in the same area for hours, I am not a bot.
•I have my /tell and /shout turned off, due to being harassed by gil sellers.
•Only /linkshell, /party, /yell, and /say are open, however, if /say and /yell become clogged with gil sellers, I will turn them off as well.
•I also craft my items for hours on end. (Finally got my gsm to 50 ^^) (Yes, I actually sit there and press all my buttons. I do have a macro for my gems tho, but I still have to press the buttons, and select which gem, and if I want to use HQ or not)
•I don't make gil on the market (logic and math are not my strong points, so I fail miserably at making gil on the MW. Looks like I will never be able to buy my little cottage. :'( )

TL;DR Not everyone who don't respond to /tells or /shouts is a bot. I know lots of people who have turned off parts of chat.