I think the Brave browser is awesome. I think the current implementation of BAT and the entire ad ecosystem needs serious work though. At this point it's not fully differentiated or better than Google Adwords and the control over the types of ads allowed on the platform still exposes users to scams and gives publishers no options to deny questionable ad content from appearing on sites. The potential is there but can they thread the needle?
I don't care about parabolic moves. If Brave becomes the dominant browser and the industry moves to a user pay model for advertising, then BAT will probably be successful as a result and the strength of the ad delivery platform will drive the price up or down. From an investor perspective it's like pre-paying for PPC ads when they were $.19 on average and waiting for the market to move to the $2 range it is now. If 1 BAT = 1 AD, we could expect the upper price limit of BAT to be around $2, assuming they can take the market share from Google who will bring everything out of the closet to defend their main revenue generator. Then again, any kind of price prognostication at this point are simply wild guesses informed by innate biases.
In the end BAT has a growing product and a plan. Compared to the rest of the crypto space, that makes it worth looking at.