OK, here is the thing. You are 100% ahead of most asking for appraisals here. Why? Because you came to it with an idea behind your name. You didn't just throw it out there with no thought, read around - you are really ahead of the game.
But here is the thing. If you were to take your idea and make that site, build it up, get dome traffic - you would have something of good value to sell.
Right now you are looking at the name through the eyes of an "End User" - the lens of who you hope buys it. That's prob not realistic as a stand alone name.
The name it's self, without your vision, offers a very targeted geo region (so total population goes from worldwide to only Miami - still a good size city) Next "Pocket" takes that target End User down to a very tiny niche group. Outside your ideas what general company/business type in Miami can use Pocket?
See - the End User Base possibilities make a sale a greater challenge - but taking your business idea live, may pay well as a developed site sale.
Good Luck,