My favorite one is the argument against adaption as a lot of people accepting bitcoins will bring more sell pressure on the currency as people will use their BTC to actually buy stuff
those cute fuzzy trolls 


Unless there is reason for normal none BTC holding joe blogs to go out and buy bitcoin to then buy his online product, then yes more BTC business accepting adoption just equates to more ways for BTC hodlers to cash out and a downward sell pressure. without creating a demand for really using BTC in the real world, we are just creating more sell pressure.
Compared to last year, i can dump bitcoins so many different places now.
i've still yet to met a person who has wanted something online, then used their bank account to buy BTC, then his btc to buy the product, when they could have just used his bank account and skipped a step. people want seamless easy transactions, BTC - BTC provides that, fiat - BTC - fiat does not.
saying that i am very much so long on bitcoin