Questions regarding sk1mming

[Buratino]

Good day all. This is my first post. I'd do a formal introduction but clearly we're ll careful on giving out any information about ourselves. You can call me Jazzy.
I'm interested in providing myself with d+p's.
It doesn't make sense all the sites selling them. The second 1 dump is compromised, everyone that used that location for the month would be closed and reissued. With that said, "if" there was a legit seller, if you don't purchase and use them within a day, chances are they will be dead. Also if these are working p+n's, why are they selling them instead of using it themselves. Seems easy enough.
This thread isn't one to talk about which sites are legit, since IMHO, I would not purchase. The purpose of this thread is to have some questions answered regarding @TM sk1mm1ng.
Now the USA is the last use the mag stripe. That is soon coming to an end.
Some banks are using anti-sk1mming items. Such as one that scrambles the mag strip information.
Question: How would it interfere with the sk1mmer only and not the reader inside the @tm?
There is also a device that alerts the bank if something was attached and shuts the terminal down.
Question: What does this look like, does anyone here know who uses them?
Anyone personally encounter the anti-sk1mmers above?
How can you be successful against these?
There's plenty of sites on both cw & dw that sells devices like bezels and overlays. Before going in, I'd like those with more knowledge than I to educate me.
This is the beginners section and that is why I posted here. I'm being polite, by all means do not think I am a beginner in other games.
I do not use ICQ or Jabber. Please don't ask me for money or to be a partner. There are others that would be glad to. Partners are with people you have years experience with.
Thanks