It's not even limited to teens - those with the most money to spend are probably more likely to be in their 20s working their first "real" jobs and having "fun"

It's not even limited to teens - those with the most money to spend are probably more likely to be in their 20s working their first "real" jobs and having "fun". They've learned about "disposable" incomes, low attachments/commitments (being truly free of parents/guardians), and feel that spending is their just reward for slogging it Monday to Friday. It's a typical "work hard, play harder" mentality, and encouraged by many cultures (including Japanese?). Alcohol is also factor in some way with many decisions - it probably doesn't come as a surprise to non-drinkers just how expensive a weekly habit can get. It also helps to be able to work on spreadsheets and compound interest calculations whilst staying strictly sober. ;) Overall in the end, it's still the same old phenomenon; advertising, but carried through a newer medium. TV infomercials, print ads and telemarketing used to be big, but that's passé now. Perhaps what I find more interesting about the OP is how there are still so many businesses with informal processes when it comes to promotion - even something as a simple as an up-to-date Google Maps listing can sometimes go neglected.