I know why people do it, BobK, and I do not judge. I merely comment. But since you know the official system & you know that when paying the tax at BanReservas you need to present your cedula for the number to get into the system, could I enquire how the AMET guy gets round this? What does he do - buy a 'job lot' from DGTT wholesale? Does he fill in the paperwork & are all of you 300 pesos revista people (or 250 in your case) in the system?
If you are, that's one thing. But if you aren't, the next little scam is
another AMET guy 'running a check' & telling you that you have a revista which is 'false' or 'not registered' or somesuch & demanding that you need to buy one of
his revistas or else you'll be fined, have car removed etc etc. We all know how these things work - it doesn't necessarily stop at today's 300 pesos. Plus, once you've been fingered as someone who prefers convenience & is prepared to pay for it, you are leaving yourself open for a whole range of other scams. So even if the 'one small step against corruption' argument doesn't appeal, maybe 'future damage control' will?