That's a very nice thank you note you wrote, @
Peter PL .
In my opinion, here are other ways to say thank you to an artist:
Buy their music.
Talk about them to your friends who don't know them.
Follow them on social media and share their posts to help promote them.
Go to the shows (if possible, if course) and buy their merchandise.
Find fellow fans and interact with them (you've found us already so it's good).
Also: try to find other fans from Poland, bring them all together and try to make noise about your liking of NIN. If you show that Poland fans really want to see NIN live, who knows? Sometimes wishes do come true.
Best of luck!
ps ETS: what's a "teitan"?